Verbindungsabbruch nach ein paar Minuten

[PMH]

Folgendes Problem mit meinem ATA-386 und Provider SIPGATE:

Wenn ich via der Telefonnummer angerufen werde, klappt alles wunderbar.
Wenn ich jemanden Anrufe, der auch bei SIPGATE ist und ein Grandsteam GXP2000 hat (ich kenne jetzt gerade nur zwei kollegen), bricht manchmal zu unterschiedlichen Zeiten die Verbindung ab.

Anrufe auf die Testnummer von SIPGATE sind einwandfrei. Ich habe den ATA-386 fuer syslogging in debug mode gesetzt und hier ist der Auszug:

2007-05-24 14:28:47	User.Debug	192.168.0.76	GS_LOG: [00:0b:82:0d:32:b7][000][FFAF][01000340] 2625 sip.c  SIP/2.0 401 Unauthorized  Via: SIP/2.0/UDP 192.168.0.76:5062;branch=z9hG4bK8aa3bdbafe998120;rport=60005;received=67.173.177.23  From: "xxxxxxxxxxxxxxxx" <sip:[email protected]>;tag=805cee38e88e6937  To: <sip:[email protected]>;tag=b11cb9bb270104b49a99a995b8c68544.891f  Call-ID: [email protected]  CSeq: 880 REGISTER  WWW-Authenticate: Digest realm="sipgate.de", nonce="4655e896e25b79ec136e7d9a00c7b2404da1c91b", stale=true  Content-Length: 0
2007-05-24 14:28:47	User.Info	192.168.0.76	GS_LOG: [00:0b:82:0d:32:b7][000][FFAF][01000340] 1623 sip.c  Send SIP message: 1 To 217.10.79.9:5060 2 0
2007-05-24 14:28:47	User.Info	192.168.0.76	GS_LOG: [00:0b:82:0d:32:b7][000][FFAF][01000340] 1769 sip.c  2 0 1 0 0
2007-05-24 14:28:48	User.Debug	192.168.0.76	GS_LOG: [00:0b:82:0d:32:b7][000][FFAF][01000340] 2625 sip.c  SIP/2.0 200 OK  Via: SIP/2.0/UDP 192.168.0.76:5062;branch=z9hG4bKfd8638cebf9045a0;rport=60005;received=67.173.177.23  From: "xxxxxxxxxxxxxxxx" <sip:[email protected]>;tag=805cee38e88e6937  To: <sip:[email protected]>;tag=b11cb9bb270104b49a99a995b8c68544.0b5b  Call-ID: [email protected]  CSeq: 881 REGISTER  Date: Thu, 24 May 2007 19:28:43 GMT  Contact: <sip:[email protected]:5062>;expires=900;received="sip:67.173.177.23:60005"  Content-Length: 0
2007-05-24 14:28:48	User.Info	192.168.0.76	GS_LOG: [00:0b:82:0d:32:b7][000][FFAF][01000340] 473 sip.c  2 0 REGISTERED 2564 880 16898
2007-05-24 14:28:49	User.Debug	192.168.0.76	GS_LOG: [00:0b:82:0d:32:b7][000][FFAF][01000340] 2625 sip.c
2007-05-24 14:28:52	User.Debug	192.168.0.76	GS_LOG: [00:0b:82:0d:32:b7][000][FFAF][01000340]  589 tone.c 0 SessionID 0 270 24 24
2007-05-24 14:28:53	User.Debug	192.168.0.76	GS_LOG: [00:0b:82:0d:32:b7][000][FFAF][01000340] 845 cm_control 0 0 0 0 320 527 6 5 0 0 1 0
2007-05-24 14:28:53	User.Info	192.168.0.76	GS_LOG: [00:0b:82:0d:32:b7][000][FFAF][01000340] 1623 sip.c  Send SIP message: 4 To 217.10.79.9:5060 0 0
2007-05-24 14:28:53	User.Info	192.168.0.76	GS_LOG: [00:0b:82:0d:32:b7][000][FFAF][01000340] 1769 sip.c  0 0 4 2564 16898
2007-05-24 14:28:53	User.Debug	192.168.0.76	GS_LOG: [00:0b:82:0d:32:b7][000][FFAF][01000340] 2625 sip.c  SIP/2.0 200 OK  Via: SIP/2.0/UDP 192.168.0.76:5062;rport=60005;received=67.173.177.23;branch=z9hG4bK78263e265eabece0  Record-Route: <sip:217.10.79.23;lr=on>  Record-Route: <sip:217.10.79.9;lr=on>  From: "xxxxxxxxxxxxxx" <sip:[email protected]>;tag=81e3431792170721  To: <sip:[email protected]>;tag=b5eb49c201a3376c  Call-ID: [email protected]  CSeq: 44195 BYE  User-Agent: Grandstream GXP2000 1.1.1.14  Contact: <sip:[email protected]:5060>  Allow: INVITE,ACK,CANCEL,BYE,NOTIFY,REFER,OPTIONS,INFO,SUBSCRIBE,UPDATE,PRACK,MESSAGE  Supported: replaces, timer  Content-Length: 0
2007-05-24 14:28:53	User.Debug	192.168.0.76	GS_LOG: [00:0b:82:0d:32:b7][000][FFAF][01000340]  589 tone.c 0 SessionID 0 534 24 24
2007-05-24 14:28:53	User.Warning	192.168.0.76	GS_LOG: [00:0b:82:0d:32:b7][702][FFAF][01000340] M-free Error: sip.c 24 989 3
2007-05-24 14:28:53	User.Warning	192.168.0.76	GS_LOG: [00:0b:82:0d:32:b7][702][FFAF][01000340] M-free Error: sip.c 23 989 1
2007-05-24 14:28:53	User.Debug	192.168.0.76	GS_LOG: [00:0b:82:0d:32:b7][000][FFAF][01000340] 588 cm_rtp.c 0 0 1 3999
2007-05-24 14:28:57	User.Debug	192.168.0.76	GS_LOG: [00:0b:82:0d:32:b7][000][FFAF][01000340] 1100 sip.c  2 1 24581 37379 13 0 0.0.0.0 440 0 13 0 1 1
2007-05-24 14:28:59	User.Debug	192.168.0.76	GS_LOG: [00:0b:82:0d:32:b7][000][FFAF][01000340] 1100 sip.c  2 1 24837 37379 13 0 0.0.0.0 0 1 13 0 1 1
2007-05-24 14:28:59	User.Info	192.168.0.76	GS_LOG: [00:0b:82:0d:32:b7][000][FFAF][01000340] 1623 sip.c  Send SIP message: 1 To 217.10.79.23:5060 2 1
2007-05-24 14:28:59	User.Info	192.168.0.76	GS_LOG: [00:0b:82:0d:32:b7][000][FFAF][01000340] 1769 sip.c  2 1 1 0 0

Hat jemand eine Idee, was es sein koennte?