asterisk users - Jul 2012 - How to send a SIP MESSAGE outside a call

Hello

My provider allows to activate/deactivate a forwarding rule by sending a 
SIP MESSAGE. This is done outside a call. That is, while there is no 
ongoing call, a SIP client just sends the following message:

    MESSAGE sip:543951354657 at callfwd.sip.providerx.com SIP/2.0
    Call-ID: b9ba106e-613a-46b9-8a4d-0efb4dc0a0f2
    CSeq: 1 MESSAGE
    To: <sip:543951354657 at callfwd.sip.providerx.com>
    From: "543951354657" <sip:543951354657 at
sip.providerx.com>;tag=...
    Max-Forwards: 70
    Supported: 100rel
    User-Agent: ProviderX-SoftPhone
    Accept: text/plain
    X-Movial-Content: application/x-movial-control;forwarding=true
    Content-Length: 0
    Via: SIP/2.0/UDP 192.168.8.72:5062;branch=z9hG4bK-.....


If successful, the server will respond with a message like the following:

    SIP/2.0 200 OK
    Call-ID: b9ba106e-613a-46b9-8a4d-0efb4dc0a0f2
    CSeq: 1 MESSAGE
    To: <sip:543951354657 at callfwd.sip.optimus.pt>;tag=0f315726
    From: "543951354657"<sip:543951354657 at
sip.optimus.pt>;tag=...
    Via: SIP/2.0/UDP 192.168.8.72:5062;branch=z9hG4bK...
    Content-Length: 0
    P-Charging-Vector: icid-value=2ad48aa502d9e80240a5da2efac9029e
    X-Movial-DisplayError: false


Basically, to activate the forwarding I need to send a MESSAGE with the 
header:

    X-Movial-Content: application/x-movial-control;forwarding=true

while to deactivate the forwarding the MESSAGE header must be:

    X-Movial-Content: application/x-movial-control;forwarding=false


I have very little experience with AMI and AGI but, from what I've read 
so far, neither of them seem to provide any function to send a SIP 
MESSAGE with custom headers...
How can I send a MESSAGE like this from Asterisk?


Thanks,
--
Tiago

----- Original Message -----
> From: "Tiago Vasconcelos" <tiago.o.vasconcelos at
gmail.com>
> To: asterisk-users at lists.digium.com
> Sent: Saturday, July 28, 2012 10:38:42 AM
> Subject: [asterisk-users] How to send a SIP MESSAGE outside a call
> 
> Hello
> 

<snip>
> I have very little experience with AMI and AGI but, from what I've
> read
> so far, neither of them seem to provide any function to send a SIP
> MESSAGE with custom headers...
> How can I send a MESSAGE like this from Asterisk?
In Asterisk 10, you can use the MessageSend application:

https://wiki.asterisk.org/wiki/display/AST/Asterisk+10+Application_MessageSend

In Asterisk 11, you'll also be able to use AMI:

https://wiki.asterisk.org/wiki/display/AST/Asterisk+11+ManagerAction_MessageSend

You may also want to look at the functions that modify the message fields:

https://wiki.asterisk.org/wiki/display/AST/Asterisk+10+Function_MESSAGE
https://wiki.asterisk.org/wiki/display/AST/Asterisk+10+Function_MESSAGE_DATA

You stated that you need to add some custom headers, which you can do with the
MESSAGE_DATA function.  In order to activate the forwarding, you could
do something like this:

exten => send_msg,1,NoOp()
same =>
n,Set(MESSAGE_DATA(X-Movial-Content)=application/x-movial-control;forwarding=true)
; If something needs to go in the body, replace this.  Otherwise,
; you can just remove it
same => n,Set(MESSAGE(body)=hello world!)
same => n,MessageSend(sip:to_address)

(Note: this wasn't tested, but hopefully it will give you an idea)

--
Matthew Jordan
Digium, Inc. | Software Developer
445 Jan Davis Drive NW - Huntsville, AL 35806 - USA
Check us out at: http://digium.com & http://asterisk.org