CCS or CAS This topic has 1 reply, 1 voice, and was last updated 21 years, 8 months ago by Gary. Viewing 2 posts - 1 through 2 (of 2 total) Author Posts 8th March 2003 at 01:45 #23969 jonGuest Hi, Anyone knows the type of PSTN signalling used in India? Is it CSS or CAS? Thanks. 12th March 2003 at 18:31 #23970 GaryGuest It depends on how you order service from the PTT. ISDN/PRI is quite common in India, and it uses CCS signaling. Author Posts Viewing 2 posts - 1 through 2 (of 2 total) The forum ‘Voice over IP’ is closed to new topics and replies.