Duc, all calls be it isdn or modem come into this box through the T1 (PRI) ports. If a call is modem call, it terminates on internal MICA modems while if its isdn, it terminates on hdlc resources. For more info, you will find this handy :
Duc, just fine. How are you doing? Long time no see.
As far as your question is concerned, T1 is just the channel for incoming calls.
Now for every incoming call you need resources inside the box to terminate those
calls. So for an incoming modem call, you need some appropriate resource which is internal modems to terminate the call. While for incoming isdn calls, you need some other resources which are called HDLC resources (note that HDLC resources are not physical resources as internal modems are).
Thank you for your patience to help me out. So the MICA modem ports on the As5300 are not the physical modems where we can plug in the RJ11/21 from telco into them. Those are internal resources only. What I can see from Cisco docs but not clearly make me think that they are modem ports where we can connect the phone lines. Users dial in from PSTN via T1-Pri and terminate on modem ports if they are calling from outside Async lines. Hope that I'm getting it right. Thanks again, good old friend.
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