[VoiceOps] Allworx Followme - no audio issue

Alex Balashov abalashov at evaristesys.com
Tue Jul 19 12:55:39 EDT 2011

This is little more than a descriptive restatement of your original 
post.  What is the SIP flow?

If there is two-way audio loss after the cell phone accepts the call, 
there must be a reinvite that is changing the SDP or some other event 
of significance associated with that.  Most likely, the problem lies 
precisely in the nature of that endpoint pivot, e.g. the new, revised 
RTP endpoints do not have direct network and transport-layer 
reachability to each other, or are otherwise unable to fulfill the 

On 07/19/2011 12:49 PM, Ujjval Karihaloo wrote:

> Call from PSTN to our Broadsoft/ACME to Customer SIP Trunk/Allworx
> Allworx forwards/followme call back out (to a cell phone) the same SIP
> trunk to us and we terminate to the PSTN (cell phone)
> PSTN cell phone answers and Allworx plays announcement - press 1 to answer
> the call.
> PSTN cell phone presses 1 to answer the call following which there is no
> audio in either direction.
> In the packet capture between Allworx and my ACME (access SIDE) - I see
> RTP flowing, I also see RTP flowing between ACME and my Upstream carrier
> who terminated the call..and inbound carrier who delivered the inbound
> call to me.
> -----Original Message-----
> From: voiceops-bounces at voiceops.org [mailto:voiceops-bounces at voiceops.org]
> On Behalf Of Alex Balashov
> Sent: Tuesday, July 19, 2011 10:43 AM
> To: voiceops at voiceops.org
> Subject: Re: [VoiceOps] Allworx Followme - no audio issue
> On 07/19/2011 12:40 PM, Ujjval Karihaloo wrote:
>> Hi All:
>>      We have a customer with Allworx PBX that is setup for followme on
>> an extension that forwards to a call Phone. When the call gets
>> forwarded, back out the SIP Turnk intous, the allworx has answer
>> confirmation which the followme/cellphone hears fine, when the
>> followme cell phone presses 1 to accept the call, all audio is lost
>> both ways.  Call stays up until disconnected. The Allworx sends a
>> REINVITE after the "1" is pressed.too
>> Anyone seen this behavior with ACME and Allworx and any remedies.
> Well, what exactly is the SIP flow?

Alex Balashov - Principal
Evariste Systems LLC
260 Peachtree Street NW
Suite 2200
Atlanta, GA 30303
Tel: +1-678-954-0670
Fax: +1-404-961-1892
Web: http://www.evaristesys.com/

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