Presence and 1-way Voice Issues iPad only

[Bob Denny]

For background, I have Bria 2 on one PC, Bria 3 on another, and Bria Android on 2 HTC Incredible phones. All working fine. I know about STUN and DNS SRV (our 3CX VoIP switch and DNS server are set up for SRV and work!). The Bria Android phones work fine on 3G as well as via our office wireless, which is behind a NAT router/wireless connected to our public-IP subnet on which our 3CX switch resides. IN other words one NAT hop to the SIP switch.

Bria for iPad 1.0.1, iPad 2 WiFi Only, G729 option. Same settings as used successfully on Android phones. Note that unless "Global IP" is turned on (not the default) the Bria iPad cannot be called, it never rings. Of course Incoming Calls and Single Register are both on. All of these settings were required for success on the Android phones. Out proxy and Auth Name are blank (again as in the Android phones). In main Advanced Settings (as opposed to the account Advanced Settings), Network Traversal, User Specified, Use STUN is ON, STUN server is stun.counterpath.com, ICE is OFF, DNS SRV is ON. Again, same as successfully used on the Android phones. And again the iPad and Androids are all using the same wireless NAT router as previously described.

Calls into the Bria iPad are fine. 2-way audio OK.

Problem: Outbound calls from the Bria iPad receive no audio. Audio from the Bria to the callee is fine.

Log Ref# ADF633DE Sent to support.

[adonis]

support is checking it.

[Bob Denny]

Hi,
Their recommendation amounts to shooting in the dark. I'd hoped they would look at my log and see what was going wrong. Here's the response:

Please try following;
Changing the Network Traversal Strategy under the Advanced Settings
-->
Try to use Default Configuration
OR
Try to use Server Managed
OR
Try Application Managed
OR
Try to set to User Specified and set ICE to ON and STUN to OFF. You don't need to make any changes for the DNS SRV setting.

Please make sure you apply the settings and run a test after every change.

[Bob Denny]

I'm at my wit's end. My Android Bria, using the same WiFi presence, same 3CX SIP switch, same extension provisioning, works fine via STUN/DNS SRV. Calling into the iPad Bria gets 2 way audio. Calling out from the iPad Bria results in no audio from callee to the iPad.

Can anyone else confirm that they have Bria iPad 1.0.1 build 7903 running via WiFi through the WiFI's NAT router? This is so simple, one NAT/Wifi router to public/routable IP on the WAN side, and the 3CX switch is right on that WAN subnet, here in our office.

[Bogdan]

From the INVITE:
You are presenting in SDP your addess for RTP: 70.167.219.234:4000.
This is your public address discovered using STUN.
If you are calling from outside your subnet (no hairpin issue) then it should work (unless some NAT port conflicts).

I guess the same address you present when you get incomng call. Perhaps a new log with that would cofirm that.

"This is so simple". Hmm, i wish i know less than i would say that it is simple....

For now it looks like other app uses port 4000 on the NAT too and the conflicts are not properly handled.
Try to change the port on the ipad e.g. to 7777 and see.

But since it is so simple then you would know the answer what's is wrong...

[Bob Denny]

OK, here I am again 6 months later. I have more important things to work on than learning the technical details (and secrets) of SIP and RTP.

You are presenting in SDP your addess for RTP: 70.167.219.234:4000.

What is SDP? I know SIP and RTP, though I don't exactly know what they do. I think SIP sets up calls and RTP handles audio. But SDP? Is this yet another protocol????? Why do I need to know this stuff? I just want to use my Bria from an iPad that is connected to a WiFi router whose WAN side is on a public subnet, and the 3CX "switch" is on that public subnet (here in the office even).

"This is so simple". Hmm, i wish i know less than i would say that it is simple....

"Simple" means not that SIP/RTP/SDP(?) is simple, but my needs are simple I think. I've paid for Bria iPad and I still cannot reliably use it in my own office!

Bria iPad [dhcp] <-> WiFiRouter <-> [local public IP] 3CX Switch

How frustrating. Whoever designed this protocol suite was probably a European academic (or worse, a committee of same) not a real engineer). I'll probably give up for another 6 months now.

[Bogdan]

SDP is Session Description Protocol. This is part of INVITE/OK SIP message.

I would suggest to try our auto fix audio helper:

viewtopic.php?f=30&t=19716

Item #11.