[cisco-voip] SCCP StopTone sent before call answered

[Erick Wellnitz]

I'm in the process of comparing a good call to the ones without ringback.
On Thu, Mar 28, 2013 at 12:48 PM, Wes Sisk <wsisk at cisco.com> wrote:

> Most likely something in the progress indicates to cut through audio so we
> stop tone on the phone and try to nail up in band audio…
>
> -wes
>
> On Mar 28, 2013, at 1:14 PM, Erick Wellnitz <ewellnitzvoip at gmail.com>
> wrote:
>
> Thanks in advance for any ideas.
>
> I have a rather strange issue with ringback.
>
> CUCM 8.0.3.20000-2
> IOS 12.4(24)T4
>
> I have a SIP trunk configured to my CUBE with several paterns pointing to
> the trunk.  This CUBE points to another CUBE in the UK.  We route calls
> from the US to the UK PSTN over the SIP trunk to the UK.  The calls connect
> and I hear the remote party fine but there is silence until the remote end
> answers.
>
> I see in the traces that we receive the 180 Ringing message over the
> trunk.  I also see the SCCP StartTone message is sent to the phone.  When
> we get the SIP 183 Session Progress message I immediately see a SCCP
> StopTone message.  I also see the SCCP StopTone message when the remote
> party answers.  Has anyone seen anything like this before?
>
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