[AusNOG] Vocus Voice issues

[Mark Andrews]

Comfort noise is likely to be your friend.  A good on hold system will
generate it.

In message <20161121183823.W841 at ali-syd-1.albury.net.au>, Ross Wheeler write
s:
> 
> 
> 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.
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-- 
Mark Andrews, ISC
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742                 INTERNET: marka at isc.org