Forward call with original Call number, please Help

@atomas wrote:

Hello, I have a problem with forward call in trunk with original ID.
Example :
A ---- call ----> B ---- forwarded to -----> C

A nad C are in PSTN
B is extension in my freepbx

My operator write me

Precondition is that from trunk they send me invite, where caller id (From ...) will be A and v requwest-uri/To: will be B

If in the same call I forward outgoing INVITE, whre CLI (From) will be not changed, in reqest-uri/To: will be C and I add Header Diversion: sip:B@my_site, where B will be number whitch forwarded the call, then we accept the information about the original number and we forward the number.

But I do not know hou to make it in FreePBX. Can somebody help me ?

Thank you.

And they send me some example but I don't no whitch config to change ...

exten => NUMBER_B,1,Set(CALLERID(num)=NUMBER_A)
same => n,SIPAddHeader(Diversion: sip:NUMBER_B@195.168.21.11)
same => n,Dial(SIP/NUMBER_C@benestra)

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