Sending and receiving sip headers from Asterisk dial plan

In this post, I want to give you a simple example of sending and receiving header parameters within the Asterisk Dial plan through multiple servers.

Server1:

[extensions]
exten => _100,1,Ringing
exten => n,SIPAddHeader(testparameter: test)
exten => n,Dial(PJSIP/Server2/100,60,tT)
exten => n,Hangup

Server2:

[extensions]
exten => _100,1,Ringing
exten => n,NoOp(SIP Header: ${SIP_HEADER(testparameter)})
same => n,Answer()
same => n,Queue(support)
same => n,Hangup() 

This post is purely to give you an idea of how it works, as the SipAddHeader function can be used in many different use cases.