[AusNOG] Vocus Voice issues

[Skeeve Stevens]

The only NAT is from CPE is the user at home...

But, we've tried Netcomm, Juniper SRX, D-Link... same same.

Happens on different backhaul carriers... only common thing seems to be the
Voice at Vocus (Amcom I presume)


...Skeeve

*Skeeve Stevens - Founder & The Architect* - eintellego Networks Pty Ltd
Email: skeeve at eintellegonetworks.com ; Web: eintellegonetworks.com

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On Mon, Nov 21, 2016 at 6:42 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.
>
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