[asterisk-users] PJSIP: how to retrieve underlying SIP Call-ID

[Michael Ulitskiy]

Hello,

I've started to play with PJSIP and got stuck at the following problem.
I need to retrieve SIP Call-ID associated with PJSIP channel. 
For inbound channel I can use ${PJSIP_HEADER(read,Call-ID)}, but that doesn't work for
outbound channel even in pre-dial or hangup handler. Whatever I do PJSIP_HEADER
seem to be unable to read headers for outbound channel.

Here's what I do:

[xyz]
exten => 999,1,NoOp(Call-ID: ${PJSIP_HEADER(read,Call-ID)})
       same => n,Dial(PJSIP/xyz011101/sip:xyz011101@<outbound_proxy>:5060,30,b(_pre_dial,s,1))
exten => h,1,NoOp()

[_pre_dial]
exten => s,1,NoOp(Call-ID: ${PJSIP_HEADER(read,Call-ID)})
       same => n,Set(CHANNEL(hangup_handler_push)=_hangup,s,1())
       same => n,Return

[_hangup]      
exten => s,1,NoOp(Call-ID: ${PJSIP_HEADER(read,Call-ID)})
       same => n,Return


Here's the result:
    -- Executing [999 at xyz:1] NoOp("PJSIP/poly_650_2_01-0000006f", "Call-ID: e3e249e5-7e8941dd-da386565 at 192.168.100.238") in new stack
    -- Executing [999 at xyz:2] Dial("PJSIP/poly_650_2_01-0000006f", "PJSIP/xyz011101/sip:xyz011101@<outbound_proxy>:5060,30,b(_pre_dial,s,1)") in new stack
    -- PJSIP/xyz011101-00000070 Internal Gosub(_pre_dial,s,1) start
    -- Executing [s at _pre_dial:1] NoOp("PJSIP/xyz011101-00000070", "Call-ID: ") in new stack
    -- Executing [s at _pre_dial:2] Set("PJSIP/xyz011101-00000070", "CHANNEL(hangup_handler_push)=_hangup,s,1()") in new stack
    -- Executing [s at _pre_dial:3] Return("PJSIP/xyz011101-00000070", "") in new stack
  == Spawn extension (xyz, 999, 1) exited non-zero on 'PJSIP/xyz011101-00000070'
    -- PJSIP/xyz011101-00000070 Internal Gosub(_pre_dial,s,1) complete GOSUB_RETVAL=
    -- Called PJSIP/xyz011101/sip:xyz011101@<outbound_proxy>:5060
  == Using SIP RTP Audio TOS bits 184
    -- PJSIP/xyz011101-00000070 is ringing
    -- PJSIP/xyz011101-00000070 Internal Gosub(_hangup,s,1) start
    -- Executing [s at _hangup:1] NoOp("PJSIP/xyz011101-00000070", "Call-ID: ") in new stack
    -- Executing [s at _hangup:2] Return("PJSIP/xyz011101-00000070", "") in new stack
  == Spawn extension (xyz, 999, 1) exited non-zero on 'PJSIP/xyz011101-00000070'
    -- PJSIP/xyz011101-00000070 Internal Gosub(_hangup,s,1) complete GOSUB_RETVAL=
  == Spawn extension (xyz, 999, 2) exited non-zero on 'PJSIP/poly_650_2_01-0000006f'
    -- Executing [h at xyz:1] NoOp("PJSIP/poly_650_2_01-0000006f", "") in new stack

As you can see I can get Call-ID of inbound channel, but I receive null for the outbound channel in both pre-dial and hangup handlers.

So my question is if there's a way to retrieve SIP Call-ID for outbound channels?
Also the 2nd question is if PJSIP_HEADER is supposed to be able to read headers of the outbound channel?

Thanks,
Michael
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