22 Dec
2010
22 Dec
'10
12:23 p.m.
Feature Requests item #1875757, was opened at 2008-01-20 14:01
Message generated for change (Comment added) made by aregr
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Category: modules
Group: None
Status: Open
Resolution: None
Priority: 5
Private: No
Submitted By: Iñaki Baz Castillo (ibc_sf)
Assigned to: Nobody/Anonymous (nobody)
Summary: Add "Reason" header as tm parameter for CANCEL when forking
Initial Comment:
Hi, according to RFC 3326 [1] (Reason Header):
3.1 Call Completed Elsewhere
A proxy forks an INVITE request and one of the
branches returns a 200 (OK). The forking proxy
includes this status code in a Reason header
field in the CANCEL request that it sends to the
rest of the branches.
Reason: SIP ;cause=200 ;text="Call completed elsewhere"
With this behaviour, if an AoR is registered in two phones and one of them answers a call,
that call will not appear as MISSED in the other phone (if the phone supports
"Reason" headers).
This could be implemented as new "tm" parameters:
modparam("tm", "add_reason_200_flag", 26)
modparam("tm", "add_reason_200_text", "Call completed
elsewhere") modparam("tm", "add_reason_200_text_avp",
"$avp(i:26)")
The last parameter would be an AVP containing the text to send in CANCEL
"Reason" header if the call has been replied with 200 in other branch. If not
set, default value ("add_reason_200_text") would be used.
To add "Reason" header, flag(26) should be set before transaction creation:
lookup("location");
switch($rc) {
case 1:
setflag(26); # Add "Reason" header in CANCELLED branches.
$avp(i:26)="Call answered in other phone";
t_relay();
exit;
}
[1] RFC 3326 - The Reason Header Field: http://www.faqs.org/rfcs/rfc3326.html
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Comment By: aregr (aregr)
Date: 2010-12-22 12:23
Message:
This would be a very useful feature indeed for all those with forking
setups. Also seems that we have a steady growing number of phone
manufacturers supporting this feature as well.
Who could fix this? -Should not be too difficult to implement?
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Comment By: Olle E. Johansson (oej)
Date: 2008-06-30 22:09
Message:
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Originator: NO
I added this to Asterisk a short while ago. I think it would be very
useful in OpenSER too.
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https://sourceforge.net/tracker/?func=detail&atid=743023&aid=187575…