Described behaviour looks like your ACK message is discarded by stack. There might be several reasons for that: 1) Cseq number doesn't match to INVITE's Cseq or Method doesn't match 2)Via branch parameter in incoming ACK is equal to VIA branch parameter of previous transactions, so stack doesn't understand what to do with this request and where is it belong. 3)Rest of session identifires such as To, From, Call-ID . 4)Make sure your ACK request is BNF well builded and there is no spelling error somewhere :-) I hope it helped _______________________________________________ Sip-implementors mailing list [email protected] https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors
