[cisco-voip] Unity xfer Getting 603 from carrier

[Anthony Holloway]

If your assessment is correct about the calling number, the carrier will
see the original or outside caller's phone number in the From field and
reject your call.  I see this being solved most of the time with a SIP
Profile on the outgoing dial-peer, which adds either a Diversion header or
a P-Asserted-Identity header.

E.g.,
https://community.cisco.com/t5/collaboration-voice-and-video/configure-and-troubleshoot-call-forward-to-the-pstn-using-sip/ta-p/3118287

On Wed, Jul 29, 2020 at 6:45 AM fred at browardcommunications.com <
fred at browardcommunications.com> wrote:

>
> Greetings all, this might be simple fix, I just haven’t dealt with this in
> a while.
>
> We have a unity AA that, when external callers call, select menu options,
> etc. Unity will send the call back to. CtiRp, which then CFA to an external
> number. You hear the Unity transfer message, 1 second of MoH, then 10
> seconds of nothing, then the call drops.
>
> Internal calls to the CFA ctirp works
>
> Internal calls to the unity ctirp then back to the CFA ctirp works.
>
> I tried having unity call the pstn number directly with same results
>
> I think the issue is with the calling number is why the carrier is sending
> the 603, but it is next to impossible to get them to tell us that.
>
> Call flow:
> Pstn>sipt>cucm >unity>cucm>ctirp-CFA-pstn
>
> Where would I change the calling number being CFA’ed from Unity to the
> PSTN?
>
> Any ideas?
>
> Thank you.
>
> /FW
>
> Sent from my iPhone
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