VoIP over Wifi



  • Astricon was last week and Sangoma came out with their wireless phone that works off of DECT. Is there a reason why there are no cordless VoIP phones over wifi? (Latency?)



  • Probably. I have a user who's griping and complaining about quality on a softphone she's using over a wireless network. I'll bet latency is the culprit.



  • Polycom had a line of Wifi portable phones the purcahsed I think from Spectralink. We could never get good quality audio out of them. Lots of 1 way audio issues or dropped packets; and roaming just never worked right. We still have customers on them but have been moving them to DECT whenever possible. I think @JaredBusch found a wifi dongle for Yealink desk phones don't remember how well it worked for his customer.



  • I use the yealink deskphones with the usb wifi in home offices where wifi traffic is minimal. No complaints so far.



  • You should set traffic shaping on wireless the same as you would on your LAN.



  • Co-channel interference, latency for hand off between 802.11 AP's as well as packet overhead
    and latency from security that was designed for data make it a poor solution for a roaming voice handset.

    For fixed handsets I have had good luck with Yealink T5 series phones so far, which have built in wifi and a bigger internal antenna compared to the USB sticks you add to previous versions.

    DECT is lower frequency, designed for voice and offers real time hand off between radios. So that is why you still see DECT 6 handsets with VOIP built in to the base, so you can register it to your PBX over the LAN.


  • Service Provider

    I have one client with Verizon rebranded Yealink T46G running over wifi with no issues. It's a small shop with a couple of Ubiquiti AC lite APs so it's totally possible given the right conditions.

    I think as a manufacturer wifi has so many issues, you probably would be hesitant to get in that game. To then add DECT on the top of wifi would just add another transport subject to external interference to troubleshoot.



  • Thanks for the suggestion of desk phones, but they still require some kind of power which is going to tie them down somewhere. I ain't about to carry a UPS and power injector with me just to have a cordless phone.

    I was thinking about something that was designed for roaming, like the DECT cordless phones.

    Thanks for the good info @bigbear & @jt1001001



  • At my last organization we were using Yealink W52P DECT phones. They were working really well when I left.



  • @coliver said in VoIP over Wifi:

    At my last organization we were using Yealink W52P DECT phones. They were working really well when I left.

    I have tried Yealink DECT since aroudn 2013/2014, but I had a couple die on me. Since then I have used Polycom for the handheld roaming phones and for the VOIP conference sets (battery charger, DECT wireless allows you to forgo all wiring and signal works great.

    Not to say I may have just gotten a bad couple handsets back then.


  • Service Provider

    @dustinb3403 said in VoIP over Wifi:

    You should set traffic shaping on wireless the same as you would on your LAN.

    Doesn't work the same. It's a bus, not a switch.


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