Here's the ASCII drawing of the call flow... BR2 phone-----SIP Voip Dial-peer-----UCM Trunk----UCM----IP Phone (sccp)----Call Transfer(no consult)(aka blind transfer)----UCM----IP Phone (sccp)
----- Original Message ----- From: "Norma Exel" To: [email protected] Subject: [OSL | CCIE_Voice] SIP Trunk Issue Date: Wed, 1 Apr 2009 23:16:14 -0500 Here's a good one! When I make a call over a sip trunk and a sccp phone picks up and performs a blind transfer to another sccp phone, there is no ringback heard on the calling phone. no MTP or annunciator is configured on the UCM cluster. Any idea where to start? I suspect UCM is not providing the SIP leg appropriate "transferring" message when the sccp phone signals for a transfer. My scenario doesn't affect H323 (inbound PRI) since ringback can be heard on a blind transfer when a call comes in on a PRI. One would believe that UCM should be able to provide the appropriate signaling back through either the H323 or SIP trunk to reflect a call transfer so that ringback would be heard with either trunk. Anybody with insight to this would be greatly appreciated. Norma -- Be Yourself @ mail.com! Choose From 200+ Email Addresses Get a Free Account at www.mail.com! -- Be Yourself @ mail.com! Choose From 200+ Email Addresses Get a Free Account at www.mail.com
