Hello,
A typical Route header will look like this:
>From RFC3261:
Route=
"Route"
HCOLON route-param
*(COMMA route-param)
; example:
;
Route: <sip:ss1.atlanta.example.com;lr>,
;
<sip:ss2.biloxi.example.com;lr>
Other examples:
Route: <sip:scscf1.ims.m-online.net:5090;lr;>
Route: <sip:scscf1.ims.m-online.net:5090;lr>,
<sip:scscf2.ims.m-online.net:5090;lr>
Route: <sip:+49xxxxxxxxxx@172.24.0.3:5060;user=phone;lr>
Also here defined the sip parameters:
http://www.iana.org/assignments/sip-parameters/sip-parameters.xhtml
br,
Despina
> Date: Fri, 25 Oct 2013 00:16:37 -0500
> From: mano...@gmail.com
> To: sip-implementors@lists.cs.columbia.edu
> Subject: [Sip-implementors] CallBack to emergency call
>
> Hello folks
>
> I have an IMS case where a terminating point for emergency calls (PSAP) is
> performing callback to the user that placed the original emergency call.
>
> It appears that the top most Route header in CallBack INVITE needs to have
> a Callback timer indication.
>
> Does anyone happen to have an example of how the Route header should look
> like?
>
> (the flow below is just a quick indication, several packets are missing)
>
> UE1 IMS SBC <==> PSAP
> | --------> | |
> | INVITE 911 | |
> | | |
> | | --------> |
> | | INVITE 911 |
> | | |
> | | <-------- |
> | | 200OK |
> | | |
> | <-------- | |
> | 200OK | |
> | | |
> | --------> | |
> | BYE | |
> | | --------> |
> | | BYE |
> | | <-------- |
> | | 200OK |
> | <-------- | |
> | 200OK | |
> | | |
> ======================================
> Callback
> ======================================
> | | |
> | | <-------- |
> | | INVITE |
> | | (CallBack) |
> | | |
> | <-------- | |
> | INVITE | |
> | (CallBack) | |
> | | |
> | --------> | |
> | 200OK | |
> | | |
> | | --------> |
> | | 200OK |
> | | |
> | --------> | |
> | BYE | |
> | | |
> | | --------> |
> | | BYE |
> | | |
> | | <-------- |
> | | 200OK |
> | | |
> | <-------- | |
> | 200OK | |
>
> thanks in advance
> Manolis
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