I am running Asterisk 13.5.0. I have the Transfer working when using the chan_sip support. However, when I try to perform a Transfer using pjsip, it is failing. The one difference I am seeing in the SIP trace is chan_sip automatically sends the Referred-By. PJSIP does not. The switch provider I am working with has never seen a REFER without the "Referred-By" line In both cases, I am performing the Transfer via AMI EXEC Transfer .... Does Asterisk 13.5.0 PJSIP support require a flag or something to force the Referred-By line to automatically be passed when a Transfer is performed? chan_sip (succeeds) 19:27:32.512123 IP (tos 0x0, ttl 64, id 11492, offset 0, flags [none], proto UDP (17), length 630) 192.168.xxx.xxx.sip > 192.168.yyy.yyy.sip: SIP, length: 602 REFER sip:3400 at 192.168.yyy.yyy:5060 SIP/2.0 Via: SIP/2.0/UDP 192.168.xxx.xxx:5060;branch=z9hG4bK58f4bd1d Max-Forwards: 70 From: <sip:3344 at 192.168.xxx.xxx>;tag=as44000cf4 To: <sip:3400 at 192.168.yyy.yyy>;tag=7Iy0JkwDC Contact: <sip:3344 at 192.168.xxx.xxx:5060> Call-ID: jdEuqpAK-0002- at 192.168.yyy.yyy CSeq: 102 REFER User-Agent: Asterisk PBX 13.5.0 Date: Thu, 20 Aug 2015 19:27:32 GMT Refer-To: <sip:370 at 192.168.yyy.yyy> Referred-By: <sip:3344 at 192.168.xxx.xxx:5060> Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY, INFO, PUBLISH, MESSAGE Supported: replaces, timer Content-Length: 0 Pjsip 18:46:58.386372 IP (tos 0x0, ttl 64, id 38690, offset 0, flags [DF], proto UDP (17), length 654) 192.168.xxx.xxx.sip > 192.168.yyy.yyy.sip: SIP, length: 626 REFER sip:3400 at 192.168.yyy.yyy:5060 SIP/2.0 Via: SIP/2.0/UDP 192.168.xxx.xxx:5060;rport;branch=z9hG4bKPjec41c3b9-d734-482d-82c1-2a6f8d9452a3 From: <sip:3344 at 192.168.xxx.xxx>;tag=3c10f423-e468-42ea-87a1-658ae106581c To: <sip:3400 at 192.168.yyy.yyy>;tag=WITKDakt Contact: <sip:192.168.xxx.xxx:5060> Call-ID: s6Wk6l6Q-0001- at 192.168.yyy.yyy CSeq: 981 REFER Event: refer Expires: 600 Supported: 100rel, timer, replaces, norefersub Accept: message/sipfrag;version=2.0 Allow-Events: message-summary, presence, dialog, refer Refer-To: <sip:370 at 192.168.yyy.yyy> Max-Forwards: 70 User-Agent: Asterisk PBX 13.5.0 Content-Length: 0 -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.digium.com/pipermail/asterisk-users/attachments/20150820/f1cd89ba/attachment.html>