Create sip account, call and return 503 service unavailable

General Help
1

I use asterisk 11.2.1, freepbx, linphone.

use freepbx create sip account 1000, 1001.
1000 call 1001 is ok.
1001 call 1000 is ok.

manual create sip account 1003 in sip_additinoal.conf.
execute “sip reload” in asterisk cli.
sip show peers is ok.

1003 call 1000 is ok.
1000 call 1003 , sip response is 503 service unavailable.

req:INVITE
res:401
req:ACK
req:INVITE
res:100
res:183 session progress
res:503 service unavailable

why?

Unfortunately, this forum can’t upload attachment file.

2

head -5 /etc/asterisk/sip_additional.conf

3

you need to add 1003 to your dialplan

edit extensions_custom.conf