Sip header manipulation for PJSIP

FreePBX Tips and Tricks
1

I recently had to add diversion header to our sip packets and we are using PJSIP. It took a while to know how to do that since PJSIP is different than SIP and I will post it here in case someone else wants to do this.

We have several trunks and we wanted to add Diversion header for some of our outbound routes ( based on the region ). If you need it at trunk level, dont need to use Execif part , just set the header:
exten =>s,n,Set(PJSIP_HEADER(add,Diversion)=sip:[email protected])

This is how I did it :

vi /etc/asterisk/extensions_override_freepbx.conf
[func-apply-sipheaders]
include => func-apply-sipheaders-custom
exten => s,1,Noop(Applying custom SIP Headers to channel, Outbound Route= ${ROUTENAME})
;Check if call is going out over XX routes, XX_Local_LD_INT is trunk name
exten => s,n,ExecIf($[“${ROUTENAME}” = “XX_Local_LD_INT”]?Set(PJSIP_HEADER(add,Diversion)=sip:[email protected]))
;Check if it call is going out over YY routes, YY_Local_LD_INT is trunk name
exten => s,n,ExecIf($[“${ROUTENAME}” = “YY_Local_LD_INT”]?Set(PJSIP_HEADER(add,Diversion)=sip:[email protected]))

Change the caller id and sip provider ip address as you need.

And on webgui, change your trunk setting as below :
Asterisk Trunk Dial Options = TWtb(func-apply-sipheaders^s^1)

and use override instead of system.

2

Does REDIRECTING() not work?

3

There are cleaner ways of manipulating SIP headers on outgoing trunk calls, and using the override file is to be avoided whenever possible. I recommend you use the native header gosub functions with macro-dialout-trunk-predial-hook

4

Happy cake day @lgaetz!

2 Likes
5

Wow, joined in 2008. Is there anyone that’s got a longer cake day?

6

I can confirm that there is at least one active user with an 18 year creation date.

1 Like
7

Looks like forum was launched 18 years ago, so there are many that predate me by a year or two. A quick glance in the admin portal shows a quite a few still active.

1 Like
8

Idid not know how to use it to did not test is
:slight_smile:

9

So you are saying call func-set-sipheader from predial-? And do not change system asterisk trunk dialout option? I will test it thanks. And Happy Cake day…

10

Yes. At its simplest, this dialplan

[macro-dialout-trunk-predial-hook]
exten => s,1,NoOp(Entering user defined context [macro-dialout-trunk-predial-hook] in extensions_custom.conf)
exten => s,n,GoSub(func-set-sipheader,s,1(X-Lorne,Happy Cake Day))
exten => s,n,MacroExit()

results in this outbound INVITE

image
image1231Ă—591 45.5 KB

1 Like
11

Which wont work in FreePBX v17, FYI. Macros have gone away. This still use macros here but not here is going come back to bite people.

12

I believe Rob and Philippe would have close to the oldest date. I would of joined in 2007 from memory. Wow the time flies.

13

May 18, 2007