I 'm new here and have the following problem 
I want a Rasperry PI make a call to play a message.
I have a ASTERISK 1.8.13.1 installed .
sip.conf
[general]
language=de
port = 5060
register=0511xxxxxxx:PASSWORD:NAME@tel.t-online.de/0511xxxxxxx
context=t-online_in
[t-online-out]
callerid=0511xxxxxxx <0511xxxxxxx>
type=peer
username=Ralf.Kruppa
fromuser=0511xxxxxxx
secret=PASSWORD
fromdomain=tel.t-online.de
host=tel.t-online.de
realm=tel.t-online.de
canreinvite=no
dtmfmode=info
insecure=very
nat=no
qualify=yes
extensions.conf
…
[t-online_in]
exten => Rufnummer,1,Dial(SIP/524)
exten => Rufnummer,n,Hangup
[t-online_out]
exten => _88.,1,SetCIDName(Rufnummer)
exten => _88.,2,Dial(SIP/${EXTEN:2}@t-online-out,tr)
exten => _88.,3 Hangup
call.call
Channel: SIP/t-online-out/01575xxxxxxx
Application: Playback
Data: /var/lib/asterisk/sounds/custom/play
Log
[Jul 1 06:29:00] WARNING[4273]: pbx_spool.c:278 safe_append: Unable to set utime on /var/spool/asterisk/outgoing/call.call: Operation not permitted
[Jul 1 06:29:00] WARNING[4270]: chan_sip.c:20366 handle_response_invite: Received response: “Forbidden” from ‘“asterisk” sip:0511xxxxxxx@tel.t-online.de;tag=as4e6d1c0c’
[Jul 1 06:29:00] NOTICE[4310]: pbx_spool.c:353 attempt_thread: Call failed to go through, reason (1) Hangup
[Jul 1 06:29:00] NOTICE[4310]: pbx_spool.c:356 attempt_thread: Queued call to SIP/t-online-out/01575xxxxxxx expired without completion after 0 attempts
Where is the problem ?
Thanks Ralf