[asterisk-users] Set qualify = yes on trunk can't do outgoing call

[basti]

Hello when I set qualify = yes on trunk I can't do outgoing call.
Incoming is always working.

[Feb 15 23:01:41] WARNING[12909][C-00000012]: app_dial.c:2525
dial_exec_full: Unable to create channel of type 'SIP' (cause 20 -
Subscriber absent)

but my linphone is registered all the time.

when set qualify = no outgoing call is working
(but i have problems when WAN IP is changed after reconnect internet
connection)

how can i solve this?
best regards