[asterisk-users] PJSIP_HEADER - Diversion header manipulation

[Davor Jovanovic]

Hi all,

I’m trying to rewrite Diversion header when call forwarding is done on 
the phone. The phone sends "302 Moved Temporarily" response and sets 
Diversion header to a local number, but before Asterisk sends this call 
towards TSP provider I need to change Diversion header to a full PSTN 
number. I am using PJSIP_HEADER in a pre-dial handler (configuration is 
below). On the same call I can add some other custom headers (logs are 
below).

Is there any chance I can rewrite Diversion header in this scenario with 
PJSIP_HEADER function? Asterisk version is 16.0.1 built from source on 
Debian 9.


Thank you

Davor


# Outgoing context - TSP provider
[outgoing]
exten => 
0123456789,1,Dial(PJSIP/${EXTEN}@${SBC_1},,b(add_diversion^FWDdiver^1))
  same => n,Hangup()

# Diversion manipulation context
[add_diversion]
exten => 
FWDdiver,1,Set(PJSIP_HEADER(add,Diversion)=<sip:full_pstn_no at example.com>\;reason=unconditional\;screen=yes\;privacy=off))
exten => 
FWDdiver,2,Set(PJSIP_HEADER(add,CustomOne)=<sip:custom_one at example.com>\;reason=unconditional\;screen=yes\;privacy=off))
exten => 
FWDdiver,3,Set(PJSIP_HEADER(add,CustomTwo)=<sip:custom_two at example.com>\;reason=unconditional\;screen=yes\;privacy=off))
exten => FWDdiver,4,Return()


Asterisk*CLI>
    -- Now forwarding PJSIP/527-00000168 to 'Local/0123456789 at outgoing' 
(thanks to PJSIP/836-00000169)
[Dec 10 10:25:08] NOTICE[26309][C-000000c0]: app_dial.c:1005 do_forward: 
Not accepting call completion offers from call-forward recipient 
Local/0123456789 at outgoing-0000002c;1
     -- Executing [0123456789 at outgoing:1] 
Dial("Local/0123456789 at outgoing-0000002c;2", 
"PJSIP/0123456789 at SBC1,,b(add_diversion^FWDdiver^1)") in new stack
     -- PJSIP/SBC1-0000016a Internal Gosub(add_diversion,FWDdiver,1) start
     -- Executing [FWDdiver at add_diversion:1] Set("PJSIP/SBC1-0000016a", 
"PJSIP_HEADER(add,Diversion)=<sip:full_pstn_no at example.com>;reason=unconditional;screen=yes;privacy=off)") 
in new stack
     -- Executing [FWDdiver at add_diversion:2] Set("PJSIP/SBC1-0000016a", 
"PJSIP_HEADER(add,CustomOne)=<sip:custom_one at example.com>;reason=unconditional;screen=yes;privacy=off)") 
in new stack
     -- Executing [FWDdiver at add_diversion:3] Set("PJSIP/SBC1-0000016a", 
"PJSIP_HEADER(add,CustomTwo)=<sip:custom_two at example.com>;reason=unconditional;screen=yes;privacy=off)") 
in new stack
     -- Executing [FWDdiver at add_diversion:4] 
Return("PJSIP/SBC1-0000016a", "") in new stack


Phone => Asterisk
U 10.201.8.192:5060 -> 10.201.1.19:5060
SIP/2.0 302 Moved Temporarily.
Diversion: <sip:836 at 10.201.1.19>;reason=unconditional.


Asterisk => TSP provider
U 10.201.1.19:5060 -> 10.201.1.15:5060
CustomOne: 
<sip:custom_one at example.com>;reason=unconditional;screen=yes;privacy=off.
CustomTwo: 
<sip:custom_two at example.com>;reason=unconditional;screen=yes;privacy=off.
Diversion: <sip:836 at 192.168.1.101>;reason=unconditional.