[AusNOG] Vocus Voice issues

[Pete Mundy]

> On 21/11/2016, at 8:42 pm, Ross Wheeler <ausnog at rossw.net> wrote:
> 
> On Mon, 21 Nov 2016, Skeeve Stevens wrote:
> 
>> Symptoms:
>>    - Call operates normally
>>    - Call gets put on hold - works normally if under 45 seconds - can
>> unhold and all works
>>    - After 45sec, the audio in one direction stops
> 
>> Bit of head scratching... anyone seen this?
> 
> Silly question, but is it by any chance behind NAT?
> 
> I had a semi-similar issue a while ago, where the device doing NAT dropped sessions after an unreasonably short time. IIRC, in that instance - the ATA could initiate an outgoing call, but would not receive an incoming call. (Forcing a re-register would fix it, but only until the NAT entry expired again)
> 
> I suppose this could happen with a "stateful firewall", where the table allows return packets only after an outgoing packet, but expires with undue haste!
> 
> R.

I was going to ask the same question! The symptoms certainly reflect those seen with a low NAT table timeout, or low SPI firewall state timeout.

If the voice device can be configured to generate music on hold then maybe that would keep the session fresh?

Pete

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