T20 can not dial out

[dede]

Hi James,
now I captured two files with the Fritzbox.
If I only look at the lines with "Protocol = SIP or SIP/SDP", I get these two lists:

unsuccessful call with T20P
58 Request INVITE sip:.....@....
59 Status 100 Trying
60 Status 401 Unauthorized
61 Request ACK sip:.....@....
62 Request INVITE sip:.....@....
63 Status 100 Trying
....
330 Status 487 Request Terminated
331 Request ACK sip:.....@....



successful call with KE1020A
140 Request INVITE sip:.....@....
141 Status 100 Trying
142 Status 401 Unauthorized
143 Request ACK sip:.....@....
144 Request INVITE sip:.....@....
145 Status 100 Trying
151 Status 183 Session Progress
154 Request PRACK sip:.....@....
155 Status 200 OK
176 Status 183 Session Progress
177 Request PRACK sip:.....@....
180 Status 200 OK
.....
411 Status 183 Session Progress
412 Request PRACK sip:.....@....
413 Status 200 OK
424 Status 180 Ringing
425 Request PRACK sip:.....@....
428 Status 200 OK
.....
804 Status 200 OK
805 Request ACK sip:.....@....
.....
1221 Request BYE sip:.....@....
1224 Status 200 OK