RE: [Serusers] PRACK

Hello, Thanks for the response. But who is generating this problem, the Cisco or the ser server? If I make an ip call between the tow ata's everything works fine, so I belive that the server is the problem. According to RFC3262: "The UAS MUST send any non-100 provisional response reliably if the initial request contained a Require header field with the option tag 100rel. If the UAS is unwilling to do so, it MUST reject the initial request with a 420 (Bad Extension) and include an Unsupported header field containing the option tag 100rel. " So, if the ser proxy will give me a 420 error with unsupported header field and not a 400 error the ATA will not require any more 100rel. Am I right? ===================================================== ip_ata_1:5060;branch=z9hG4bK5ce290af84b14296;rport=5060;received=ip_ata_1_nat <sip:0332yyyy@domain.com;user=phone>;tag=fee886471600e72424ce85e67d30b332.6542 > > 050620|11:48:28 Call-ID: 2133411222@ip_ata_1 > > 050620|11:48:28 CSeq: 1 INVITE > > 050620|11:48:28 Proxy-Authenticate: Digest > > realm="domain.com", nonce="rrrr" > > 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=407; Proxy Authentication > > Required > > 050620|11:48:28 [0]Tx INVITE to ip_sip_server:5060 > > 050620|11:48:28 > > 050620|11:48:28 ACK > > sip:0332yyyy@domain.com;user=phone > > SIP/2.0 > > 050620|11:48:28 Via: SIP/2.0/UDP > > ip_ata_1:5060;branch=z9hG4bK5ce290af84b14296 <sip:0332yyyy@domain.com;user=phone>;tag=fee886471600e72424ce85e67d30b332.6542 username="332xxxx",realm="domain.com",nonce="rrrr",uri="sip:03 ip_ata_1:5060;branch=z9hG4bKf33e54a2a402e527;rport=5060;received=ip_ata_1_nat ip_ata_1:5060;branch=z9hG4bKf33e54a2a402e527;rport=5060;received=ip_ata_1_nat === message truncated === __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com