RE: [Serusers] PRACK

Hello, I have a problem with tow Cisco ATA 186 both having version v3.2. When I try to make a call on my side I hear that the phone is ringing 3 times and then the call is disconnected. On the other side, the telephone is ringing 10 times. I belive that the problem is when one Cisco sends a PRACK packet and and it receive "420 Bad request" from de sip server. Then the call is disconnected with error "504 Gateway Time-out". Below I put the logs from the tow ATAs. Any help in solving this problem will be appreciated. Thanks. Call from: 3327xxxx to 33271yyyy (log from the calling ATA):

050620|11:48:28 Calling 0332yyyy 050620|11:48:28 SCC Cmd[0:0]CLIP 050620|11:48:28 SCC Cmd[0:0]CALL 050620|11:48:28 [0]INVITE Retry 0 050620|11:48:28 [0:0]Tx Msg to ip_sip_proxy:5060 050620|11:48:28 050620|11:48:28 INVITE sip:0332yyyy@domain.com;user=phone SIP/2.0 050620|11:48:28 Via: SIP/2.0/UDP ip_ata_1:5060;branch=z9hG4bK5ce290af84b14296 050620|11:48:28 From: <sip:332xxxx@domain.com;user=phone>;tag=2064987569 050620|11:48:28 To: <sip:0332yyyy@domain.com;user=phone> 050620|11:48:28 Call-ID: 2133411222@ip_ata_1 050620|11:48:28 CSeq: 1 INVITE 050620|11:48:28 Contact: <sip:332xxxx@ip_ata_1:5060;user=phone;transport=udp> 050620|11:48:28 User-Agent: Cisco ATA 186 v3.2.0 atasip (041111A) 050620|11:48:28 Expires: 300 050620|11:48:28 Allow: ACK, BYE, CANCEL, INVITE, NOTIFY, OPTIONS, REFER, REGISTER, PRACK, UPDATE 050620|11:48:28 Supported: 100rel,replaces 050620|11:48:28 Content-Length: 236 050620|11:48:28 Content-Type: application/sdp 050620|11:48:28 050620|11:48:28 v=0 050620|11:48:28 o=332xxxx 57793347 57793347 IN IP4 ip_ata_1 050620|11:48:28 s=ATA186 Call 050620|11:48:28 c=IN IP4 ip_ata_1 050620|11:48:28 t=0 0 050620|11:48:28 m=audio 16384 RTP/AVP 8 0 101 050620|11:48:28 a=rtpmap:8 PCMA/8000/1 050620|11:48:28 a=rtpmap:0 PCMU/8000/1 050620|11:48:28 a=rtpmap:101 telephone-event/8000 050620|11:48:28 a=fmtp:101 0-15 050620|11:48:28 050620|11:48:28 [0]Rx Msg from ip_sip_server:5060 050620|11:48:28 050620|11:48:28 SIP/2.0 407 Proxy Authentication Required 050620|11:48:28 Via: SIP/2.0/UDP

050620|11:48:28 From: <sip:332xxxx@domain.com;user=phone>;tag=2064987569 050620|11:48:28 To:

050620|11:48:28 From: <sip:332xxxx@domain.com;user=phone>;tag=2064987569 050620|11:48:28 To:

050620|11:48:28 Call-ID: 2133411222@ip_ata_1 050620|11:48:28 CSeq: 1 ACK 050620|11:48:28 User-Agent: Cisco ATA 186 v3.2.0 atasip (041111A) 050620|11:48:28 Content-Length: 0 050620|11:48:28 050620|11:48:28 050620|11:48:28 [0]INVITE Retry 0 050620|11:48:28 [0:0]Tx Msg to ip_sip_server:5060 050620|11:48:28 050620|11:48:28 INVITE sip:0332yyyy@domain.com;user=phone SIP/2.0 050620|11:48:28 Via: SIP/2.0/UDP ip_ata_1:5060;branch=z9hG4bKf33e54a2a402e527 050620|11:48:28 From: <sip:332xxxx@domain.com;user=phone>;tag=2064987569 050620|11:48:28 To: <sip:0332yyyy@domain.com;user=phone> 050620|11:48:28 Call-ID: 2133411222@ip_ata_1 050620|11:48:28 CSeq: 2 INVITE 050620|11:48:28 Contact: <sip:332xxxx@ip_ata_1:5060;user=phone;transport=udp> 050620|11:48:28 User-Agent: Cisco ATA 186 v3.2.0 atasip (041111A) 050620|11:48:28 Proxy-Authorization: Digest

32yyyy(a)domain.com&quot;,response=&quot;ihuhuh&quot; 050620|11:48:28 Expires: 300 050620|11:48:28 Allow: ACK, BYE, CANCEL, INVITE, NOTIFY, OPTIONS, REFER, REGISTER, PRACK, UPDATE 050620|11:48:28 Supported: 100rel,replaces 050620|11:48:28 Content-Length: 236 050620|11:48:28 Content-Type: application/sdp 050620|11:48:28 050620|11:48:28 v=0 050620|11:48:28 o=332xxxx 57793355 57793355 IN IP4 ip_ata_1 050620|11:48:28 s=ATA186 Call 050620|11:48:28 c=IN IP4 ip_ata_1 050620|11:48:28 t=0 0 050620|11:48:28 m=audio 16384 RTP/AVP 8 0 101 050620|11:48:28 a=rtpmap:8 PCMA/8000/1 050620|11:48:28 a=rtpmap:0 PCMU/8000/1 050620|11:48:28 a=rtpmap:101 telephone-event/8000 050620|11:48:28 a=fmtp:101 0-15 050620|11:48:28 050620|11:48:28 [0]Rx Msg from ip_sip_server:5060 050620|11:48:28 050620|11:48:28 SIP/2.0 100 Trying 050620|11:48:28 Via: SIP/2.0/UDP

050620|11:48:28 From: <sip:332xxxx@domain.com;user=phone>;tag=2064987569 050620|11:48:28 To: <sip:0332yyyy@domain.com;user=phone> 050620|11:48:28 Call-ID: 2133411222@ip_ata_1 050620|11:48:28 CSeq: 2 INVITE 050620|11:48:28 Server: Sip EXpress router (0.8.14-5 (i386/linux)) 050620|11:48:28 Content-Length: 0 050620|11:48:28 050620|11:48:28 050620|11:48:28 Response=100; Trying 050620|11:48:29 [0]Rx Msg from ip_sip_server:5060 050620|11:48:29 050620|11:48:29 SIP/2.0 100 trying -- your call is important to us 050620|11:48:29 Via: SIP/2.0/UDP

050620|11:48:29 From: <sip:332xxxx@domain.com;user=phone>;tag=2064987569 050620|11:48:29 To: <sip:0332yyyy@domain.com;user=phone> 050620|11:48:29 Call-ID: 2133411222@ip_ata_1 050620|11:48:29 CSeq: 2 INVITE 050620|11:48:29 Server: Sip EXpress router (0.8.14-5 (i386/linux)) 050620|11:48:29 Content-Length: 0 050620|11:48:29 050620|11:48:29 050620|11:48:29 Response=100; Trying 050620|11:48:29 [0]Rx Msg from ip_sip_server:5060 050620|11:48:29 050620|11:48:29 SIP/2.0 180 Ringing 050620|11:48:29 Via: SIP/2.0/UDP

050620|11:48:29 From: <sip:332xxxx@domain.com;user=phone>;tag=2064987569 050620|11:48:29 To: <sip:0332yyyy@domain.com;user=phone>;tag=811613285 050620|11:48:29 Call-ID: 2133411222@ip_ata_1 050620|11:48:29 CSeq: 2 INVITE 050620|11:48:29 Require: 100rel 050620|11:48:29 RSeq: 1 050620|11:48:29 Contact: <sip:332yyyy@ip_ata_2:5060;user=phone;transport=udp> 050620|11:48:29 Server: Cisco ATA 186 v3.2.0 atasip (041111A) 050620|11:48:29 Allow: ACK, BYE, CANCEL, INVITE, NOTIFY, OPTIONS, REFER, REGISTER, PRACK, UPDATE 050620|11:48:29 Content-Length: 0 050620|11:48:29 050620|11:48:29 050620|11:48:29 Response=180; Ringing