Choppy Voice on OBI using GV

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obi-master:
Here is my configuration

Internet: AT&T Uverse
Down Speed: 18mbps
Up Speed: 1.5 Mbps
Router: AT&T Uverse 2Wire 3800HGV-B, no other additional router
Devices: Vonage, SPA3102, OBI 110 all connected to AT& Uverse using wire.
OBI Configuration: No PSTN, SP1 is GV and SP2 is Rynga
SPA Config: Vonage line goes to SPA 3102 just to be able to dial from outside. No physical phone connected to SPA. All calls are made using Vonage. 

Issue: When I used GV using OBI I can't hear some of the words the other party is saying. Not sure if it's a port issue or something else. Help will be greatly appreciated.

Hope I didn't miss to give out any information.

RonR:
You may need to determine what range of RTP ports each VoIP device is using, make sure there is no overlap in them, and possibly put explicit port forwarding in your router in order to keep them all happy (audio-wise).

obi-master:
I will change the ports for Vonage to 10000 - 20000 UDP and for OBI from 20001 to 30000 UDP. I will test and let you know the results.

RonR:
There are two sets of RTP ranges on the OBi.  One for ITSPA and one for ITSPB.

obi-master:
Changed in both places and also changed port forwarding in AT&T Uverse router/modem but still have the same issue

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