extensions.conf:

[home]
...
exten => _*X.,1,Dial(Local/${EXTEN:1}@gv-outbound,60,)


Console (-cvvv) output:

[Oct 26 22:00:13] NOTICE[26357]: chan_sip.c:21289 handle_request_invite: Call from '10' to extension '*18002255288' rejected because extension not found in context 'home'.