[asterisk-users] sporadic one-way audio

[Brent Davidson]

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.

Thanks,
Brent Davidson