asterisk users - Mar 2019 - 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.

Dan
-------------- next part --------------
An HTML attachment was scrubbed...
URL:
<http://lists.digium.com/pipermail/asterisk-users/attachments/20190325/39eeb1e4/attachment.html>

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.

Dan

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.

Dan
-------------- next part --------------
An HTML attachment was scrubbed...
URL:
<http://lists.digium.com/pipermail/asterisk-users/attachments/20190328/6b2efc0d/attachment.html>

On Thu, Mar 28, 2019, at 11:10 AM, Dan Cropp wrote:
>  
> 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.
There is no way to configure it. It would have to be removed from
res_pjsip_refer's code itself. The presence of "norefersub" in
Supported also isn't supposed to enable it. It's just for stating it is
supported. It's supposed to be enabled by the presence of the
"Refer-Sub" header in the REFER itself. I don't believe we set
that on the REFER we produce, we only care if we receive a REFER with it in
place.

-- 
Joshua C. Colp
Digium - A Sangoma Company | Senior Software Developer
445 Jan Davis Drive NW - Huntsville, AL 35806 - US
Check us out at: www.digium.com & www.asterisk.org