[asterisk-dev] PJSIP REFER question

[Dan Cropp]

Joshua helped answer some questions on the asterisk-users list.

With Cisco switch, we've encountered a problem where Cisco does not send NOTIFY subscription updates if the Supported header includes norefersub.
Cisco is not handling this correctly, but getting Cisco (or any of the large switch vendors) to fix their bugs is impossible.

In Asterisk, chan_sip we are able to perform REFER (transfer) with Cisco.  SIP debugging shows chan_sip does not include the norefersub.
The easy solution is for us to keep using chan_sip and not PJSIP.  However, PJSIP is much better overall and chan_sip is basically deprecated.
We really want to stop using chan_sip for some systems, but we can't without PJSIP handling all these.

I'm wondering if any asterisk developers can provide more insight on including the norefersub in the res_pjsip_refer when the load module?
Is this setting really needed?
If setting needs to remain, how difficult would it be to write code to make this setting configurable?
In our use case, we need to REFER calls to Cisco endpoint.  However, Cisco will not REFER calls to us.

Have a great day!

Dan
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.digium.com/pipermail/asterisk-dev/attachments/20190328/e7d3b8a0/attachment.html>