Hi,
I am having an issue getting Kamailio to properly cancel a call.
I initiate the call with an INVITE from Asterisk and then hang up.
According to rfc3665 the call flow should be:
3.8. Unsuccessful No Answer
Alice Proxy 1 Proxy 2 Bob
| | | |
| INVITE F1 | | |
|--------------->| INVITE F2 | |
| 100 F3 |--------------->| INVITE F4 |
|<---------------| 100 F5 |--------------->|
| |<---------------| |
| | | 180 F6 |
| | 180 F7 |<---------------|
| 180 F8 |<---------------| |
|<---------------| | |
| CANCEL F9 | | |
|--------------->| | |
| 200 F10 | | |
|<---------------| CANCEL F11 | |
| |--------------->| |
| | 200 F12 | |
| |<---------------| |
| | | CANCEL F13 |
| | |--------------->|
| | | 200 F14 |
| | |<---------------|
| | | 487 F15 |
| | |<---------------|
| | | ACK F16 |
| | 487 F17 |--------------->|
| |<---------------| |
| | ACK F18 | |
| 487 F19 |--------------->| |
|<---------------| | |
| ACK F20 | | |
|--------------->| | |
In my case I only have one proxy - the Kamailio box, and the call is coming
from Asterisk instead of Alice.
The is the call flow that I am seeing:
Asterisk Kamailio SIP_phone
| | |
| INVITE | |
|--------------->| INVITE |
| 100 |--------------->|
|<---------------| 100 |
| |<---------------|
| | |
| | 180 |
| 180 |<---------------|
|<---------------| |
| CANCEL | |
|--------------->| |
| | CANCEL |
| |--------------->|
| 200 Canceling | |
|<---------------| |
| | 200 |
| |<---------------|
| | |
| | |
| | 487 |
| |<---------------|
| | ACK |
| 487 |--------------->|
|<---------------| |
| ACK | |
|--------------->| |
| CANCEL | |
|--------------->| |
| 200 Canceling | |
|<---------------| |
| CANCEL | |
|--------------->| |
| 200 Canceling | |
|<---------------| |
It looks like the problem is that that "200 Canceling" has a To: tag and
it shouldn't.
======================================
# cancel from Asterisk:
U 2011/05/24 15:18:56.123714 3.3.3.3:5060 -> 2.2.2.2:5060
CANCEL sip:SIP_13034445555@2.2.2.2 SIP/2.0.
Via: SIP/2.0/UDP 3.3.3.3:5060;branch=z9hG4bK51c9602a;rport.
From: "+13032223333" <sip:+13032223333@3.3.3.3>;tag=as4c415d87.
To: <sip:SIP_13034445555@2.2.2.2>.
Call-ID: 605b8de40a05924177085d71154bda77@3.3.3.3.
CSeq: 102 CANCEL.
User-Agent: VerbalWorld.
Max-Forwards: 70.
Content-Length: 0.
# 200 canceling from Kamailio to asterisk:
U 2011/05/24 15:18:56.127349 2.2.2.2:5060 -> 3.3.3.3:5060
SIP/2.0 200 canceling.
Via: SIP/2.0/UDP 3.3.3.3:5060;branch=z9hG4bK51c9602a;rport=5060.
From: "+13032223333" <sip:+13032223333@3.3.3.3>;tag=as4c415d87.
To: <sip:SIP_13034445555@2.2.2.2>;tag=4ed8ab9f3ed29a77613bb14b3431ff43-2f34.
Call-ID: 605b8de40a05924177085d71154bda77@3.3.3.3.
CSeq: 102 CANCEL.
Server: kamailio (3.1.3 (i386/linux)).
Content-Length: 0.
======================================
Why is kamialio adding a To: tag?
Portion of kamailio.cfg
=====================
...
route
{
...
route(WITHINDLG);
### only initial requests (no To: tag) from here on
if (is_method("CANCEL"))
{
if (t_check_trans())
{
xlog("L_INFO", "MAIN: Recieved Cancel, t_check_trans is true\n");
...
t_relay();
exit;
}
...
Thanks!
Carl
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