Re: [Freeswitch-users] Early media: Sending 180 instead of 183?

we are doing a lot with ISDN-connections, while ISDN in germany seems to be very different from the ISDN in the usa. our carriers asked us to only send a 180 instead of the 183 because, as i wrote above, 183 messages are not mapped reliable to ISUP as written in the specification ITU-T Rec. Q.1912.5. the a-leg sends an IAM or INVITE, but does not receive an answer - this can differ from a-leg to a-leg. we know, that this problem is quite special, but we have the same problems with different carriers.