The AIM-VOICE-30 has a limited support for high-complexity voice codecs (G.729, G.723.1 etc). It support up to 16 concurrent calls that use these codecs.If you need full support - 30 calls for E1 or 24 calls for T1 - you will need a NM-HDV or a NM-HD...

H.245 is a protocol utilized for media negotiation in H.323 world. H.245 tunneling is a technique to use the same SETUP session (TCP:1720|TCP:1721) to transport the protocol. This is useful for overcoming firewall restriction and in order to speed up...

It's a example:controller E1 0/0 pri-group timeslots 1-31interface Serial0/0:15 no ip address no logging event link-status isdn switch-type primary-qsig isdn incoming-voice voice isdn bchan-number-order ascending no cdp enable