Strange problem with SIP extension, asterisk and a vpn

hakimian · #1 (**permalink**) January 3rd, 2006, 01:50 AM

I have setup a test system running asterisk-1.0.8. I have setup xten-lite as an extension and I have that working ask expected when connecting from the local network. When I connect via a vpn (no firewall blocking rules through the vpn) and I call from that extension, I can't hear anything on the other end until I send sound from my end (ie tap the mic or say hello etc.). Once I say something, things seem to work normally. Any idea what I'm missing?

hakimian · #2 (**permalink**) January 5th, 2006, 04:13 AM

I have found a little more information. While xten-lite has this problem, I am able to use kphone without the same symptoms. The only problem with kphone is very poor sound quality. Does anyone have any ideas on what I might need to change on xten-lite's setup to get it to work properly?

mberlant · #3 (**permalink**) January 5th, 2006, 02:39 PM

How much true bandwidth do you have through your VPN tunnel?

hakimian · #4 (**permalink**) January 5th, 2006, 02:44 PM

I don't know the specific throughput, not enough for kphone to sound good.

. It is enough for xten-lite, but that is the one that does not seem to listen unless I'm talking. I don't think that problem is related to throughput, but if you do, I can measure it and let you know.

mberlant · #5 (**permalink**) January 5th, 2006, 04:16 PM

I was just grasping. 'Tis a puzzler.

dualarrow · #6 (**permalink**) January 13th, 2006, 04:02 AM

hakimian,

After trying to fix a problem that I thought was to do with SIP and TDM400 bridging, I now find my problem seems to be identical to yours. I'm also using xlite as a SIP phone into asterisk, out through a TDM400 into the PSTN. If I yell into the PSTN side, the connection comes to life. It seems asterisk doesnt answer the call properyl.

-- Executing Dial("SIP/532-30d8", "ZAP/35/92125532") in new stack
-- Called 35/92125532
-- Zap/35-1 answered SIP/532-30d8

The last line appears when I yell into the PSTN phone. Until I see that line I get no audio out of the PSTN. If I use IAX instead of SIP, it all works fine.

Did you find a solution to this problem ?

Thanks,
Andrew

dualarrow · #7 (**permalink**) January 13th, 2006, 04:45 AM

hakimian,

I went through a similar path as you. I downloaded another SIP softphone (SJPhone) and tried it. It works first time every time (I havent tried it too many times yet).

Must be some type of issue with xlite. Strange as I havent had problems with it before.

Andrew

hakimian · #8 (**permalink**) January 13th, 2006, 12:16 PM

The problem does seem to be just with xlite. I have tried 3 or 4 other phones and they don't have the problem. Unfortunately, none of the other phones I have tried are as good as xlite in sound quality.