Blind transfer UCID

[mjm23]

Hi,
I have a system where I got calls routing from a remote site to SM, then to MPP then blind transferred to CM (VDN). My question is, how can I preserve the UCID for a single call?

 

[Wanebo]

There's a special feature package for preserving UCID's across multiple CM's.

 

[mjm23]

so I get this working. Since the remote PBX doesn't have the capability to handle REFER messages, it initiates another call in the form of INVITE. with that being said, a new call-id is generated thus Avaya thinks it is another call and creates a new UCID. to fix this problem, I introduced an SBC in-between and let it handle REFER calls.