[cisco-voip] Consult Transfer over SIP trunks over Multiple Gateways

[Nick Matthews]

At this point you have to check debugs.  'show call active voice
brief' will tell you what IP address the gateways are using.  If there
is a signaling error the wrong IP may be sent.  Alternatively, there
could be a misconfig or bug, with something like an MTP.  The SIP
proxy is also possibly modifying the process.  There really are too
many components to give you a magic bullet for this one.

-nick

On Fri, May 14, 2010 at 9:15 AM, Cheng, Karen <Karen.Cheng at racq.com.au> wrote:
> Hey guys,
>
>
>
> I have a weird one.
>
>
>
> 1 CUCM cluster 7.1.2
>
> 3 Voice gateways - 3845's
>
> 1 SIP trunk per gateway
>
>
>
> External Party 1 ISDN --> Voice Gateway 1 --> SIP Proxy --> CUCM --> Phone
>
>
>
> Call gets connected and two way audio.
>
>
>
> While still connected the Phone makes a consult transfer to an external
> number.
>
>
>
> Phone --> CUCM --> Voice Gateway 2 --> ISDN External Party 2
>
>
>
> While the phone is connected to the external party two way audio is still
> working.
>
>
>
> Phone completes the transfer and external party 1 is connected to external
> party 2.
>
>
>
> I seem to get either 1 way audio or no audio whatsoever.
>
>
>
> I've made sure IP Routing is on the voice gateways, hard set the codec just
> in case it was causing problems, enabled voice rtp send-recv, have
> allow-connections sip to sip enabled.
>
>
>
> The same scenario but with a Direct Transfer instead works perfectly
> everytime.
>
>
>
> Does anyone have any ideas?
>
>
>
> Appreciate any help.
>
>
>
> Karen Cheng
>
> Voice Network Engineer
>
>
>
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