Hello! I have a question to the asterisk dial plan. I have the following situation: 1. There is a Sip-Call from Bob@my_Asterisk to Alice@WHATEVER (Call-ID:10@WHATEVER) 2. There is a Sip-Call from Carol@my_Asterisk.com to Ralph@my_Asterisk but this goes through the Dialplan. So that there are actually two calls Carol->Asterisk (Call-ID:20@my_Asterisk) and Asterisk->Ralph (Call-ID:21@my_Asterisk) Now Carol@my_Asterisk sends an REFER to the Asterisk with the objective that the call Carol replaces Bob in the first call (Call-ID:10@WHATEVER). She does so by adding a Refer-To Header to her REFER Message: Refer-To: <sip:Alice@my_Asterisk.com?Replaces=10%40WHATEVER%.....> Bob, Carol and Ralph are regstered Users in my_Asterisk. Now my question: What might I add to the extensions.conf or sip.conf that Asterisk processes this REFER? Thank you very much, Kalle