03-06-2023 10:56 PM
What is the use case of "Out of Dialog Refer CSS" on SIP Trunk?
03-06-2023 11:20 PM
03-07-2023 12:34 AM
I already seen the CUCM Help Page but not really clear.
03-07-2023 01:06 AM
And which part is not clear? What's an "out of dialog refer"? If yes, probably google helps.
The only scenario where I configure it, is in conjunction with Unity. Then this CSS is used, if Unity transfers the call back to CUCM.
In conjunction with CMS, the "Rerouting CSS" is used.
03-07-2023 01:47 AM
I googled and I didnt find clear explanation. I seen example that puts a CSS in the Out of dialog refer css field but without giving the reason.
For Unity Connection Transfer Rules, the Rerouting CSS must be used to allow the transfer but I dont think the Out-Of-Dialog CSS is needed in this case because I configured Unity Transfer Rules without it and it works.
03-07-2023 02:35 AM
This allows the SIP server on the other end of the trunk to issue a REFER for a call that it is not involved in, ie out of dialog. The most common (legitimate) example is CUC MWI. Treat this as sensitive; the CSS probably should be limited to on-net destinations.
03-07-2023 03:06 AM
But MWI is sent with the SIP NOTIFY message.
03-07-2023 10:04 AM
It does use Notify, but it is sent out of dialogue.
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