[asterisk-users] Explain PJSIP user matching within inbound SIP trunks

[Olivier]

Hello,

I'm setting an Asterisk 13.14.1 box (Debian Stretch with packaged
Asterisk)  to implement SIP trunking services ie to both trunk with carrier
trunks and IPBX trunks from various brands.

For various reasons, I was inclined to implement this services with
pjsip_wizard.conf and I'm realizing I still have some remaining questions.

For the moment, letting registration questions aside, which of the
following sentences is correct for Asterisk's PJSIP stack:

1. it would identify an incoming call only looking at From header ignoring
IP settings (both IP address and port),
2. it would identify an incoming call only looking both at From header and
IP settings (both IP address and port),
3. it would identify an incoming call only looking both at IP settings,
ignoring From header for identification but using it for other things
(setting CallerID, ...).

Best regards
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