PJSIP Compact headers

We have a feature request to add GUI support to enable compact headers globally for pjsip:

https://issues.freepbx.org/browse/FREEPBX-23492

It looks like @billsimon is possibly using this feature, but since I don’t recall seeing it discussed before, I thought I would raise the topic to see who is currently doing this or sees value in it for their setups?

I gave it a quick test, this might be the second time in my career when I’ve looked at a SIP trace with compact headers. Looks weird to me

v: SIP/2.0/UDP <redacted>:5060;rport;branch=z9hG4bKPjf0494084-0864-43da-9256-180acf1daddb
f: "P310" <sip:[email protected]<redacted>>;tag=3e7e5c67-2d9d-460f-8577-b5ad70aabbbb
t: <sip:[email protected]<redacted>;ob>
m: <sip:[email protected]<redacted>:5060>
i: a1fbfb17-b5f2-4b84-b293-236124774984
CSeq: 31384 INVITE
Allow: OPTIONS, INVITE, ACK, BYE, CANCEL, UPDATE, PRACK, REGISTER, SUBSCRIBE, NOTIFY, PUBLISH, MESSAGE, REFER
k: 100rel, timer, replaces, norefersub, histinfo
x: 1800
Min-SE: 90
P-Asserted-Identity: "P310" <sip:[email protected]<redacted>>
Max-Forwards: 70
User-Agent: FPBX-15.0.23.9(18.12.1)
c: application/sdp
l:   223
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The m: line (short form of Contact:) always throws me off because I am used to looking for m= lines in SDPs.

One provider that I know of that uses compact form is CallCentric. Telnyx allows you to toggle the feature for your SIP trunks.

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