I have a question in the below sceanrio in Service-examples draft,
What will be the behaviour of Alice user agent on receiving messages F5,
F10 and F13.
These responses have same Via branch parameter but different To tag hence
it will result in different dialog creation. How will UA deal with these
dialogs? And if multiple dialogs are created, then will the first dialog
created by F5 terminate after timeout?
2.8 Call Forwarding - No Answer
Alice Proxy User B1 User B2
| | | |
| INVITE F1 | | |
|--------------->| INVITE F2 | |
|(100 Trying) F3 |------------->| |
|<---------------|180 Ringing F4| |
| 180 Ringing F5 |<-------------| |
|<---------------| | |
| Request Timeout |
| | | |
| | CANCEL F6 | |
| |------------->| |
| | 200 OK F7 | |
| |<-------------| |
| | 487 F8 | |
| |<-------------| |
| | ACK F9 | |
| |------------->| |
|(181 Call is Being Forwarded) F10 |
|<---------------| | INVITE F11 |
| |--------------------------------->|
| | | 180 Ringing F12 |
| 180 Ringing F13|<---------------------------------|
|<---------------| | 200 OK F14 |
| |<---------------------------------|
| 200 OK F15 | | |
|<---------------| | |
| ACK F16 | | |
|--------------->| | ACK F17 |
| |--------------------------------->|
| Both way RTP Established |
|<=================================================>|
| BYE F18 | | |
|--------------->| | BYE F19 |
| |--------------------------------->|
| | | 200 OK F20 |
| 200 OK F21 |<---------------------------------|
|<---------------| | |
| | | |
F5 180 Ringing Proxy -> Alice
SIP/2.0 180 Ringing
Via: SIP/2.0/TLS client.atlanta.example.com:5061;branch=z9hG4bK74bf9
;received=192.0.2.103
Record-Route: <sips:ss1.example.com;lr>
From: Alice <sips:[EMAIL PROTECTED]>;tag=1234567
To: Bob <sips:[EMAIL PROTECTED]>;tag=3145678
Call-ID: [EMAIL PROTECTED]
CSeq: 1 INVITE
Contact: <sips:[EMAIL PROTECTED]>
Content-Length: 0
F10 (181 Call is Being Forwarded) Proxy -> Alice
SIP/2.0 181 Call is Being Forwarded
Via: SIP/2.0/TLS client.atlanta.example.com:5061;branch=z9hG4bK74bf9
;received=192.0.2.103
From: Alice <sips:[EMAIL PROTECTED]>;tag=1234567
To: Bob <sips:[EMAIL PROTECTED]>
Call-ID: [EMAIL PROTECTED]
CSeq: 1 INVITE
Content-Length: 0
F13 180 Proxy -> Alice
SIP/2.0 180 Ringing
Via: SIP/2.0/TLS client.atlanta.example.com:5061;branch=z9hG4bK74bf9
;received=192.0.2.103
Record-Route: <sips:ss1.example.com;lr>
From: Alice <sips:[EMAIL PROTECTED]>;tag=1234567
To: Bob <sips:[EMAIL PROTECTED]>;tag=765432
Call-ID: [EMAIL PROTECTED]
CSeq: 1 INVITE
Contact: <sips:[EMAIL PROTECTED]>
Content-Length: 0
Regards,
Udit
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