Choppy Voice on OBI using GV
OBi-Guru:
Please send email to support@obihai.com with your OBi number (200 xxx xxx), we can help debug the issue.
MichiganTelephone:
Quote from: RonR on March 15, 2011, 01:46:52 pm
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).
Here we go again… before I say anything else, I will give you the benefit of the doubt and ask if you can cite any authority for this statement. Because in the years I've been working with VoIP, I have never heard it said that VoIP devices on the same network cannot use the same RTP ports, and as many VoIP devices as I have running simultaneously (PLUS an Asterisk/FreePBX server) I should have encountered problems long ago if that were really an issue. To me that statement sounds patently silly, like saying you can't run two web browsers on the same network at the same time because they both use port 80 for http (obviously, that would be wrong). But maybe this is another case where a more explicit explanation would help me understand, so I'll ask how you came up with this.
obi-master:
I did some more testing. I plugged out everything and just plugged the OBI 110, restarted my Modem/Router. everything seems to work fine. Then I plugged in the Vonage phone. SPA 3102 is still out and I see voice issues. Seems to me like Vonage is creating trouble. Vonage on the other hand works fine with no issues.
RonR:
Do you have access to the Vonage ATA configuration such that you were able to verify exactly what RTP ports it's actually using?
By default, the OBi uses 16600 - 16798 and 16800 - 16998.
Any overlap between the two devices is likely to cause audio problems. Even without an obvious overlap, it still may be necessary to make explicit port forwarding entries in your router to each device for their particular RTP ranges if the router is not well behaved. Audio problems due to Network Address Translation (NAT) and SIP/RTP handling in routers is not an uncommon problem.
obi-master:
The issue was resolved when I put the OBI behind the Vonage phone or the SPA 3102. I have it behind the SPA for almost 3-4 days and haven't seen an issue so far.
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