Hi, I want to use TopLink Express as an outgoing provider with clip-no-screening. Toplink support says the PBX (FreePBX 18.16.0) have to send the CID as p-preferred-identity. The used extensions have a valid number in the CID field. Support says no CID is sent as p-preferred-identity.
I found some information related with this problem in this forum, But the information seems to be old, only by editing files or slightly different.
Any good solutions?
P-preferred-identity with CID of the extension needed for TopLink Express Clip-No-Screening outbound
Did you select “send p-asserted-identity-header” (send RPID) in the advanced extension settings?
Yes, “Send P-Asserted-Identity-header” in “send RPID” field is default and active. I tried “Send Remote ID header too”.
But it´s all about sending “P-Preferred-Identity”!
FreePBX does not support setting P-Preferred-Identity in the GUI. You have to write a custom predial hook in the extensions_custom.conf. We had the same thing with the Deutsche Telekom when using call forwarding. Our trunk requires a valid caller id that belongs to our number block in the P-Preferred-Identity header. This is what it looks like:
[macro-dialout-trunk-predial-hook]
exten => s,1,Noop(Entering user defined context macro-dialout-trunk-predial-hook in extensions_custom.conf)
;Set needed sip header to apply to the Telekom standard 1TR118, Absatz 2.12 and make forwarding calls working
exten => s,n,GoSub(func-set-sipheader,s,1(P-Preferred-Identity,<sip:[email protected]>))
exten => s,n,MacroExit
Just for clarification. The Deutsche Telekom also supports the P-Asserted-Identity header as an alternative. But FreePBX always set the original caller id into the header. So the GUI settings would still not work. Maybe this helps.
Thanks joni1802. I hoped, that there is a simple solution to this problem. Unfortunately I have multiple trunks and I´m not sure the other trunks will ignore the message. Anyone reading this, can find some information on this topic on Hooking for fun and income
Hope I find some time to test some ‘hooks and loops’ or better ‘hooks and noops’ 
There’s dialplan here for determining the trunk name:
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