Issues calling SIP service unavailable

Guys, need some help here, i am quite new to PBX
so i have setupa new FreePBX to make intercom possible with my hikvision doorbell
Created 3 sip extensions
2000 = outdoor post
2001 = indoor post
2002 = android (linphone)
they are all registered
Calling works from 2000 to 2002 and from 2001 to 2002 , so the android direction is working fine to accept doorbell calls from indoor and outdoor station!

Calling doesnt work from 2002 to 2001 or from 2001 to 2001 , so i cant call my indoor station?

any idea why? what am i missing? if i dial 2001 with linphone, i get immediately ‘service unavailable’

below are logs, first log is a working log from 2002 to 2001 , second log is a non workning log from 2001 to 2002 , i dont see any errors there? logs are almost the same?

any idea?

here are log files :

log 1 : working : https://www.dropbox.com/s/jz34mkisprsrbtw/full%20debug%20from%20internal%20to%20android?dl=0
log 2 : not working : https://www.dropbox.com/s/0imzx5vui4qq5rl/full%20debug%20from%20android?dl=0

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