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

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