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    FreePBX Remote Extension Problems

    IT Discussion
    freepbx sip voip pbx telephony udp networking security
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    • scottalanmillerS
      scottalanmiller @coliver
      last edited by

      @coliver said in FreePBX Remote Extension Problems:

      @RamblingBiped said in FreePBX Remote Extension Problems:

      The caller is not originating from our FreePBX instance, and is spamming the device directly.

      Wouldn't that seem to indicate that blocking all traffic but the SIP traffic from the PBX would resolve the issue of unsolicited calls?

      I guess I might have the wrong end of the stick... are the phones getting calls that are NOT from the PBX? Rather than the PBX having anonymous calls routed through it?

      RamblingBipedR coliverC 2 Replies Last reply Reply Quote 2
      • RamblingBipedR
        RamblingBiped @scottalanmiller
        last edited by

        @scottalanmiller said in FreePBX Remote Extension Problems:

        @coliver said in FreePBX Remote Extension Problems:

        With that Yealink I'm pretty sure you can limit communication over SIP to just the Asterisk server. I think it is the security section.

        That's not where the security concern is, though. It's the other way, you want to limit it on the PBX. That people can use your handset for other things really doesn't matter.

        The problem is the calls are being made directly to the device, circumventing the PBX completely... I'm getting odd extensions like 10001 and 1001 ringing the phone constantly.

        I found an option in the devices configuration for IP calling that was enabled. So far (fingers crossed) since disabling that the problem has stopped.

        For anyone else experiencing the issue, the option is:

        Yealink WEB UI > Features tab > General Information Page > "Allow IP Calling"

        Set the above to Disabled and confirm changes.

        scottalanmillerS 1 Reply Last reply Reply Quote 1
        • scottalanmillerS
          scottalanmiller @RamblingBiped
          last edited by

          @RamblingBiped said in FreePBX Remote Extension Problems:

          @scottalanmiller said in FreePBX Remote Extension Problems:

          @coliver said in FreePBX Remote Extension Problems:

          With that Yealink I'm pretty sure you can limit communication over SIP to just the Asterisk server. I think it is the security section.

          That's not where the security concern is, though. It's the other way, you want to limit it on the PBX. That people can use your handset for other things really doesn't matter.

          The problem is the calls are being made directly to the device, circumventing the PBX completely... I'm getting odd extensions like 10001 and 1001 ringing the phone constantly.

          I found an option in the devices configuration for IP calling that was enabled. So far (fingers crossed) since disabling that the problem has stopped.

          For anyone else experiencing the issue, the option is:

          Yealink WEB UI > Features tab > General Information Page > "Allow IP Calling"

          Set the above to Disabled and confirm changes.

          Sorry, I had misunderstood. Yes, disabling IP calling would likely solve the issue.

          RamblingBipedR 1 Reply Last reply Reply Quote 1
          • RamblingBipedR
            RamblingBiped @scottalanmiller
            last edited by

            @scottalanmiller said in FreePBX Remote Extension Problems:

            @coliver said in FreePBX Remote Extension Problems:

            @RamblingBiped said in FreePBX Remote Extension Problems:

            The caller is not originating from our FreePBX instance, and is spamming the device directly.

            Wouldn't that seem to indicate that blocking all traffic but the SIP traffic from the PBX would resolve the issue of unsolicited calls?

            I guess I might have the wrong end of the stick... are the phones getting calls that are NOT from the PBX? Rather than the PBX having anonymous calls routed through it?

            Exactly. It seems that there are scripts running constantly looking for open sip ports on public IPs. When they find them they attempt to make calls directly to the IP hoping to uncover an avenue of exploitation.

            1 Reply Last reply Reply Quote 1
            • RamblingBipedR
              RamblingBiped @scottalanmiller
              last edited by

              @scottalanmiller said in FreePBX Remote Extension Problems:

              @RamblingBiped said in FreePBX Remote Extension Problems:

              @scottalanmiller said in FreePBX Remote Extension Problems:

              @coliver said in FreePBX Remote Extension Problems:

              With that Yealink I'm pretty sure you can limit communication over SIP to just the Asterisk server. I think it is the security section.

              That's not where the security concern is, though. It's the other way, you want to limit it on the PBX. That people can use your handset for other things really doesn't matter.

              The problem is the calls are being made directly to the device, circumventing the PBX completely... I'm getting odd extensions like 10001 and 1001 ringing the phone constantly.

              I found an option in the devices configuration for IP calling that was enabled. So far (fingers crossed) since disabling that the problem has stopped.

              For anyone else experiencing the issue, the option is:

              Yealink WEB UI > Features tab > General Information Page > "Allow IP Calling"

              Set the above to Disabled and confirm changes.

              Sorry, I had misunderstood. Yes, disabling IP calling would likely solve the issue.

              Yep, seems to have fixed the issue. However, I do find it kind of odd that FreePBX GUI has an option for defining a specific port number for an extension that basically does nothing...

              Either way, problem resolved! Thanks to @coliver for pointing me in the right direction. I had initially looked through the configuration and not found the BURIED option that I was needing.

              1 Reply Last reply Reply Quote 0
              • coliverC
                coliver @scottalanmiller
                last edited by

                @scottalanmiller said in FreePBX Remote Extension Problems:

                @coliver said in FreePBX Remote Extension Problems:

                @RamblingBiped said in FreePBX Remote Extension Problems:

                The caller is not originating from our FreePBX instance, and is spamming the device directly.

                Wouldn't that seem to indicate that blocking all traffic but the SIP traffic from the PBX would resolve the issue of unsolicited calls?

                I guess I might have the wrong end of the stick... are the phones getting calls that are NOT from the PBX? Rather than the PBX having anonymous calls routed through it?

                That's how I read it. But that brings up another issues, shouldn't the registration process prevent this from happening?

                mlnewsM 1 Reply Last reply Reply Quote 0
                • mlnewsM
                  mlnews @coliver
                  last edited by

                  @coliver said in FreePBX Remote Extension Problems:

                  @scottalanmiller said in FreePBX Remote Extension Problems:

                  @coliver said in FreePBX Remote Extension Problems:

                  @RamblingBiped said in FreePBX Remote Extension Problems:

                  The caller is not originating from our FreePBX instance, and is spamming the device directly.

                  Wouldn't that seem to indicate that blocking all traffic but the SIP traffic from the PBX would resolve the issue of unsolicited calls?

                  I guess I might have the wrong end of the stick... are the phones getting calls that are NOT from the PBX? Rather than the PBX having anonymous calls routed through it?

                  That's how I read it. But that brings up another issues, shouldn't the registration process prevent this from happening?

                  No registration used when there is no PBX involved.

                  coliverC 1 Reply Last reply Reply Quote 0
                  • coliverC
                    coliver @mlnews
                    last edited by

                    @mlnews said in FreePBX Remote Extension Problems:

                    @coliver said in FreePBX Remote Extension Problems:

                    @scottalanmiller said in FreePBX Remote Extension Problems:

                    @coliver said in FreePBX Remote Extension Problems:

                    @RamblingBiped said in FreePBX Remote Extension Problems:

                    The caller is not originating from our FreePBX instance, and is spamming the device directly.

                    Wouldn't that seem to indicate that blocking all traffic but the SIP traffic from the PBX would resolve the issue of unsolicited calls?

                    I guess I might have the wrong end of the stick... are the phones getting calls that are NOT from the PBX? Rather than the PBX having anonymous calls routed through it?

                    That's how I read it. But that brings up another issues, shouldn't the registration process prevent this from happening?

                    No registration used when there is no PBX involved.

                    So the phone was just accepting all SIP requests. Glad you fixed it @RamblingBiped .

                    scottalanmillerS 1 Reply Last reply Reply Quote 1
                    • RamblingBipedR
                      RamblingBiped
                      last edited by

                      Aaaaaand I just received another call from some random extension. 😐

                      Problem un-resolved.

                      scottalanmillerS wirestyle22W 2 Replies Last reply Reply Quote 0
                      • scottalanmillerS
                        scottalanmiller @coliver
                        last edited by

                        @coliver said in FreePBX Remote Extension Problems:

                        @mlnews said in FreePBX Remote Extension Problems:

                        @coliver said in FreePBX Remote Extension Problems:

                        @scottalanmiller said in FreePBX Remote Extension Problems:

                        @coliver said in FreePBX Remote Extension Problems:

                        @RamblingBiped said in FreePBX Remote Extension Problems:

                        The caller is not originating from our FreePBX instance, and is spamming the device directly.

                        Wouldn't that seem to indicate that blocking all traffic but the SIP traffic from the PBX would resolve the issue of unsolicited calls?

                        I guess I might have the wrong end of the stick... are the phones getting calls that are NOT from the PBX? Rather than the PBX having anonymous calls routed through it?

                        That's how I read it. But that brings up another issues, shouldn't the registration process prevent this from happening?

                        No registration used when there is no PBX involved.

                        So the phone was just accepting all SIP requests. Glad you fixed it @RamblingBiped .

                        Yeah, that's actually pretty standard. You can just throw a bunch of phones on a network and dial each other via IP. No one does it, but nearly all phones support it out of the box.

                        1 Reply Last reply Reply Quote 0
                        • scottalanmillerS
                          scottalanmiller @RamblingBiped
                          last edited by

                          @RamblingBiped said in FreePBX Remote Extension Problems:

                          Aaaaaand I just received another call from some random extension. 😐

                          Problem un-resolved.

                          Well that sucks. Look for a setting called something like "Anonymous SIP".

                          RamblingBipedR 1 Reply Last reply Reply Quote 1
                          • RamblingBipedR
                            RamblingBiped @scottalanmiller
                            last edited by

                            @scottalanmiller said in FreePBX Remote Extension Problems:

                            @RamblingBiped said in FreePBX Remote Extension Problems:

                            Aaaaaand I just received another call from some random extension. 😐

                            Problem un-resolved.

                            Well that sucks. Look for a setting called something like "Anonymous SIP".

                            How about "Allow SIP Trust Server Only"?

                            scottalanmillerS 1 Reply Last reply Reply Quote 0
                            • wirestyle22W
                              wirestyle22 @RamblingBiped
                              last edited by wirestyle22

                              @RamblingBiped said in FreePBX Remote Extension Problems:

                              Aaaaaand I just received another call from some random extension. 😐

                              Problem un-resolved.

                              Is there a direct number associated with the phone that they could be calling directly instead of routing to it?

                              RamblingBipedR coliverC scottalanmillerS 3 Replies Last reply Reply Quote 0
                              • RamblingBipedR
                                RamblingBiped @wirestyle22
                                last edited by RamblingBiped

                                @wirestyle22 said in FreePBX Remote Extension Problems:

                                @RamblingBiped said in FreePBX Remote Extension Problems:

                                Aaaaaand I just received another call from some random extension. 😐

                                Problem un-resolved.

                                Is there a direct number associated with the phone that they could be calling directly instead of routing to it?

                                No, I've actually got the DID/inbound route for dialing the phone directly tied to a Ring Group that rings a pair of phones; that is one of the reasons I know it is being dialed directly.

                                1 Reply Last reply Reply Quote 1
                                • coliverC
                                  coliver @wirestyle22
                                  last edited by coliver

                                  @wirestyle22 said in FreePBX Remote Extension Problems:

                                  @RamblingBiped said in FreePBX Remote Extension Problems:

                                  Aaaaaand I just received another call from some random extension. 😐

                                  Problem un-resolved.

                                  Is there a direct number associated with the phone that they could be calling directly instead of routing to it?

                                  Not only that but a DID would most likely be going through the PBX.

                                  1 Reply Last reply Reply Quote 3
                                  • scottalanmillerS
                                    scottalanmiller @RamblingBiped
                                    last edited by

                                    @RamblingBiped said in FreePBX Remote Extension Problems:

                                    @scottalanmiller said in FreePBX Remote Extension Problems:

                                    @RamblingBiped said in FreePBX Remote Extension Problems:

                                    Aaaaaand I just received another call from some random extension. 😐

                                    Problem un-resolved.

                                    Well that sucks. Look for a setting called something like "Anonymous SIP".

                                    How about "Allow SIP Trust Server Only"?

                                    That sounds good.

                                    RamblingBipedR 1 Reply Last reply Reply Quote 0
                                    • scottalanmillerS
                                      scottalanmiller @wirestyle22
                                      last edited by

                                      @wirestyle22 said in FreePBX Remote Extension Problems:

                                      @RamblingBiped said in FreePBX Remote Extension Problems:

                                      Aaaaaand I just received another call from some random extension. 😐

                                      Problem un-resolved.

                                      Is there a direct number associated with the phone that they could be calling directly instead of routing to it?

                                      A DID points to the PBX and is stripped out before going to the phones. DIDs don't pass through the PBX.

                                      1 Reply Last reply Reply Quote 0
                                      • RamblingBipedR
                                        RamblingBiped @scottalanmiller
                                        last edited by

                                        @scottalanmiller said in FreePBX Remote Extension Problems:

                                        @RamblingBiped said in FreePBX Remote Extension Problems:

                                        @scottalanmiller said in FreePBX Remote Extension Problems:

                                        @RamblingBiped said in FreePBX Remote Extension Problems:

                                        Aaaaaand I just received another call from some random extension. 😐

                                        Problem un-resolved.

                                        Well that sucks. Look for a setting called something like "Anonymous SIP".

                                        How about "Allow SIP Trust Server Only"?

                                        That sounds good.

                                        So far I'm back to sweet sweet silence... I'll keep my fingers and toes crossed.

                                        wirestyle22W scottalanmillerS 2 Replies Last reply Reply Quote 0
                                        • wirestyle22W
                                          wirestyle22 @RamblingBiped
                                          last edited by wirestyle22

                                          @RamblingBiped Hope this is the solution. I unfortunately have Cisco CM and its my first time managing VoIP

                                          scottalanmillerS 1 Reply Last reply Reply Quote 0
                                          • scottalanmillerS
                                            scottalanmiller @RamblingBiped
                                            last edited by

                                            @RamblingBiped said in FreePBX Remote Extension Problems:

                                            @scottalanmiller said in FreePBX Remote Extension Problems:

                                            @RamblingBiped said in FreePBX Remote Extension Problems:

                                            @scottalanmiller said in FreePBX Remote Extension Problems:

                                            @RamblingBiped said in FreePBX Remote Extension Problems:

                                            Aaaaaand I just received another call from some random extension. 😐

                                            Problem un-resolved.

                                            Well that sucks. Look for a setting called something like "Anonymous SIP".

                                            How about "Allow SIP Trust Server Only"?

                                            That sounds good.

                                            So far I'm back to sweet sweet silence... I'll keep my fingers and toes crossed.

                                            Awesome

                                            1 Reply Last reply Reply Quote 0
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