Hello, devs, i have this situation. if FS sends an INVITE to a Nortel switch and the Nortel answer is SIP 503, FS does not send the ACK to the Nortel, any guidance please. Here is a trace of the Nortel answer. SIP/2.0 503 Service Unavailable. Via: SIP/2.0/UDP 67.220.147.141;received=67.220.147.141;branch=z9hG4bK5Q6g5UjNZeQZr;rport=5060. From: "9143345048" <sip:+9143345048@67.220.147.141>;tag=5maaU2Sa3gNHH. To: <sip:+59386510685@190.166.232.141;user=phone
;tag=f1b31366541302012101718172. Call-ID: 37e5bc92-934b-1230-4986-782bcb61be68. CSeq: 34920047 INVITE. Server: CS2000_NGSS/9.0. k: 100rel. Allow: ACK,BYE,CANCEL,INVITE,OPTIONS,INFO,SUBSCRIBE,REFER,NOTIFY,PRACK,UPDATE. Content-Disposition: signal;handling=optional. c: application/ISUP;version=. Content-Length: 6. ......
Thanks in advance for your help. Luis Jiménez