All, I committed a pjsip patch pull request in pjsip project to support SIP 3xx embedded header. It inserts stand-alone SIP headers based on SIP 3xx Contact header URI header parameters into the redirect SIP INVITE messages. It is a common feature supported by any SIP implementations, such as Metaswitch, Oracle SBC, Ribbon, etc. It should solve the issue that it is difficult to pass useful information using SIP 3xx in Asterisk. If anybody wants to try, the patch link is attached.
https://github.com/pjsip/pjproject/pull/3085/commits/b065eef9913df144445757808b352c2ce9054809 To use this patch, please follow the steps 1. Download Asterisk 18 source code 2. Run “./configure --with-pjproject-bundled --with-jansson-bundled”. 3. Apply the patch to ./third-party/pjproject/source/pjsip/src/pjsip-ua/sip_inv.c 4. Build/install/run Asterisk 5. In pjsip.conf, the redirect server endpoint should be configured with “redirect_method=uri_pjsip” 6. When the redirect server returns a SIP 3xx with Contact header, say “Contact: <sip:xxxxxxxxxxx@a.b.c.d?Test=test>;q=0.99”, the redirected SIP INVITE message should contain “Test: test” header. Please me know if you have any questions. Sincerely, Di-Shi Sun.
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