[cisco-voip] CUCM Shared Line Appearance (SIP phones)

[Ryan Ratliff (rratliff)]

Without verifying for myself I would guess that is the sip call if for the call on the shared line. This phone needs to know that so it could resume or relay call state correctly to the UI.

-Ryan

On Sep 12, 2015, at 8:39 AM, Mark Holloway <mh at markholloway.com<mailto:mh at markholloway.com>> wrote:

Hi all. When CUCM sends a SIP Invite to shared lines on SIP phones the user portion contains some sort of (what appears to b) a randomly calculated alpha-numeric string. Is there any information or documentation available on how Cisco actually calculates what this string will be?

Here is an example of a SIP Invite going to two SIP phones sharing the same phone number

INVITE sip:8cc951b7-86b6-0c74-1e4d-c0108c268dc2 at 10.232.50.81:49422;transport=tcp SIP/2.0
INVITE sip:8cc951b7-86b6-0c74-1e4d-c0108c268dc2 at 10.232.50.91:51945;transport=tcp SIP/2.0


Thanks,
Mark

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