[asterisk-users] One way audio problem on gateway to PSTN after some time, no NAT involved

[François Delawarde]

Hi,

I have similar symptoms (usually one-way audio like you, but sometimes 
echoed, distorded, or low volume sound), in a simpler configuration, 
using just SIP with a few phones and a TDM400 card with two FXOs:
Asterisk --> PSTN

I have kernel 2.6.18-XEN and using Asterisk 1.4

François.



asterisk at nicox.org wrote:
>
> Did you solved this Problem?
>
> I have the same problem, and i can't solve it, did you know anything 
> about?
>
> Thanks
>
> Nico
>
>
> On Thu, 14 Sep 2006, Kai Militzer wrote:
>
>> Hello everyone,
>>
>> since some weeks I experience strange problems on my gateways to the
>> PSTN. The gateways use chan_ss7 and SIP. My setup is roughly like that
>>
>> SER --> Asterisk A --> Asterisk B (chan_ss7) --> PSTN
>>
>> What happens is, that after a while (uptime was a least two days) the
>> gateway starts to not transmit audio to the PSTN on outgoing calls, but
>> the caller can still hear the called party. There is no NAT involved and
>> firewall rules allow the RTP ports defined in rtp.conf on both asterisk
>> (A and B) machines. The SIP packages look good, no errors messages from
>> asterisk or anything else, so I have really no idea what causes it and I
>> cannot reproduce it except by waiting till it happens again. :(
>>
>> Now the strange thing is, that if I restart the asterisk all works fine
>> again. A reload does not help, only a restart. Until now I came across
>> this phenomenon two times on different machines and it all started about
>> three weeks ago. Before that I ran asterisk 1.2.10 on the machines and
>> then updated to 1.2.11. I looked through the Changelog but coulnd't find
>> anything that seems related, but I guess it's a bug that was introduced
>> somewhere between 1.2.10 and 1.2.11 ...
>>
>> Does anyone else have similar problems?
>>
>> Regards,
>> Kai
>>
>> -- 
>> Kai Militzer                 WESTEND GmbH  |  Internet-Business-Provider
>> Technik                      CISCO Systems Partner - Authorized Reseller
>>                             Lütticher Straße 10      Tel 0241/701333-14
>> km at westend.com               D-52064 Aachen              Fax 0241/911879
>>
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