Phone Number can not use Context

In sip.conf

[13435465654654654]
username=13435465654654654
secret=1234
nat=yes
type=friend
context=didx_in

in extensions.conf
[didx_in]
exten => 13435465654654654,1,Dial(SIP/13435465654654654)

it can not run

must remove context

like

In sip.conf

[13435465654654654]
username=13435465654654654
secret=1234
nat=yes
type=friend

in extensions.conf
[default]
exten => 13435465654654654,1,Dial(SIP/13435465654654654)

it run,why?

what cannot run? Are you saying Asterisk will not start? Are you saying you cannot dial the number in that context?

simplification: You have phone number 123 (intead of 13435465654654654)
using phone with number 123 You want to dial number 123 and ring phone number 123. for me it’s a loop.
If your telephone doesn’t have 2 lines (like x-lite or SPA-941) Asterisk will count it “busy”.
what do You see in CLI> (no debug for now please) when You make a call ?