[asterisk-users] Asterisk Transfers

Dan Cropp dan at amtelco.com
Thu Mar 28 08:49:09 CDT 2019

Is there no one who knows if there is a way to turn off the norefersub setting?

Supported: norefersub

This happens in the TRYing, OK, and other commands in response to the INVITE.

For chan_sip, I noticed it does not send the norefersub.  As a result, Cisco then sends NOTIFY packets with TRYing, Ringing, OK inside them.  This basically gives the chan_sip code the ability to know if the REFER (Transfer) is succeeding or not.


From: asterisk-users <asterisk-users-bounces at lists.digium.com> On Behalf Of Dan Cropp
Sent: Monday, March 25, 2019 4:03 PM
To: asterisk-users at lists.digium.com
Subject: [asterisk-users] Asterisk Transfers

Does anyone know if there is a way to disable the norefersub for PJSIP?
It appears this is causing problems with a test we're running with Cisco.

A wireshark trace from a system where the transfer with Cisco works versus a trace with Asterisk/Cisco shows one big difference being the supported: norefersub

The REFER Accepted response is received by Asterisk.
However, Cisco doesn't send the NOTIFY messages with 100 Trying followed by 404 Not Found.

>From what we've been able to determine, this is a direct result of
200 OK packet including
Supported: 100rel, timer, replaces, norefersub

Specifically, the norefersub.

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