[asterisk-users] sporadic one-way audio

[Steve Davies]

2009/10/16 Ishfaq Malik <ish at pack-net.co.uk>:
>
> Brent Davidson wrote:
>> We have several offices running Asterisk version 1.4.20.1, and OSLEC
>> with Rhino R4FXO-EC and one running a Digium TDM800P card for interface
>> to analog lines.  All offices are running Snom 300 phones.  Phones all
>> have static addresses and are on the same physical network as the server.
>>
>> The problem we are having is that every so often we get someone calling
>> in where we can hear their voice, but they can't hear us.  If we
>> immediately call them back everything is fine.  The problem affects all
>> offices and also happens when making sip to sip calls from one snom 300
>> to another.
>>
>> In addition we periodically have calls that drop off in the middle of a
>> conversation like the connection was lost.  I haven't been able to
>> replicate any of these problems and the people that are having them
>> can't seem to keep track of when they occur so I can go back and look in
>> the logs.
>>
>> I suspect that both problems may be related though.  Possibly a
>> registration issue?  Any ideas are welcome.
>>
>>
> Hi
>
> For the sporadic one way audio, check that the codec list in the snom
> phones is the same as set by the server. The codec list is in the RTP
> tab of the identities.
>
> Hope that helps
>
> Ish
>

Also check that your DNS servers are working and can resolve
everything. I saw an issue similar to what you describe when a snom300
could not resolve its NTP server address.

I cannot explain it, but sorting out DNS sorted out the communication issue.

Regards,
Steve