Question about ISDN/ISUP interworking in Q.699 in ISDN http://www.dslreports.com/forum/r19399689 en Sat, 30 Aug 2008 11:32:09 EDT Sat, 30 Aug 2008 11:32:09 EDT Question about ISDN/ISUP interworking in Q.699 http://www.dslreports.com/forum/remark,19399689 anon : Hi!

I have a question about ISDN/ISUP interworking - q.699.

in section "3.1.1.3 Sending of the Address Complete Message (ACM)", it has:

c) En bloc receiving is used on the DSS 1 side and a Progress indicator information element (except with value No. 8, in-band information or an appropriate pattern is now available, No. 3, originating address is non-ISDN, or No. 4, call has returned to the ISDN) is received in a CALL PROCEEDING message or in a PROGRESS message.

Why these 'exceptions'? especially for the PI=8 in call proceeding case?

thanks,
ancientmoon]]> http://www.dslreports.com/forum/remark,19399689 Wed, 07 Nov 2007 12:34:29 EDT