Losing audio on incoming calls
M105:
Forwarding the RTP ports didn't help. I will continue to kick this around and see what if I can figure it out. I find it hard to believe that my Netopia business class router is not compatible with the GV XMPP protocol since I have been running SIP through it via Gizmo5 for 2 years as well as Echolink and the like.
Has anyone else experienced random loss of audio from the other party on your Obi? I would love to hear from you.
RonR:
Here's some interesting reading regarding one-way audio by Aaron Clauson, the creator of SIP Sorcery, entitled "The bullet proof solution to one way audio: buy a new router":
http://sipsorcery.wordpress.com/2009/12/15/the-bullet-proof-solution-to-one-way-audio-buy-a-new-router/
If you read far enough, he concludes:
"My recommended solution to anyone experiencing persistent one-way audio issues is to forget about all the solutions except STUN (that’s STUNv1 – Simple Traversal of User Datagram Protocol). If STUN doesn’t fix the problem for you then throw away your router and get a new one."
If you're interested in the deep-down technical details as to why SIP/RTP/NAT is problematic, Aaron has an in-depth description here:
http://sipsorcery.wordpress.com/2009/08/05/nat-rtp-and-audio-problems/
His conclusion here is:
"The best advice I can give to anyone having consistent audio issues on VoIP calls is to google their router model and see if there are any other people having the same issue and if they were able to fix it. If that doesn’t yield anything try and borrow a different router from a friend and see if the audio is better with that. If it is I’d personally replace the router as the long term frustration of audio problems on calls far outweighs $100 or less on a new router."
M105:
Yeah that is interesting reading and I never had any problems with SIP. In fact this router is designed for SIP and Netopia even offers a version of it with a built-in ATA! Apparently XMPP is a slightly different animal.
SteveInWA:
Hmm, you mention that your router is "designed for SIP" -- that may be a clue. I had a router some years back that had some internal settings for SIP, that, when ENabled, caused external SIP clients (softphone or ATA) to NOT work. So, those router settings had to do with the router itself supporting SIP. Have you looked for and disabled any such settings? It sounds counter-intuitive, but it's worth trying.
I agree with Ron that the router needs to be eliminated as the culprit; a worthwhile test would be to put your integrated DSL modem/router into bridge mode (just use it as a DSL modem and temporarily disable the router section), and let the OBi grab an IP address directly from your ISP's DHCP server (if that is supported by your ISP), or else borrow a Linksys or D-Link router, plug that into your DSL box, plug the OBi into the router, and see if that fixes it.
I have never had to mess with port forwarding, firewall settings, etc, to make VoIP work, when the router is working properly. I have a friend who had a Actiontec integrated DSL modem/router combo that never worked with SIP, either. Sometimes the telcos that provide these integrated modem/router boxes have the configurations altered to intentionally disable things like VoIP, although you said your PAP2T worked, so this is a mystery.
One last thing: have you tried the OBi/Netopia combo with a ITSP other than Google? It would be helpful to know if it's limited to Google vs. another provider. Sipgate, for example, is free and works reliably enough to use as a benchmark. Same goes for a basic/free Callcentric account.
M105:
Last question first: Yes I ran the Obi110 with Gizmo5 SIP for about 3 weeks before they went away. No problems.
The router does have a setting for SIP passthrough. I will turn it off and give that a try. Thanks for the feedback!
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