Call control protocols over which technology ?

Hello, I am a little confused over which call control protocols are used over which layer 2 technologies.
My understanding is as follows:
- internet ADSL connection to PSTN = VOIP, therefore can use MGCP, H323 or SIP as call control protocols to your ITSP.
- ISDN PRI digital connection to PSTN = ? (which control protocol(s)) ?
- FXO analog port connection to PSTN = ?(which control protocol(s)) ?
Can someone please tell me what control protocols are used for ISDN PRI digital and FXO analog connections.
Thanks kindly for any help.

Hi
FXO : is a voice card Foreign Exchange Office (FXO) interface is an RJ-11 connector that allows an analog connection to be directed at the public switched telephone network's (PSTN's) central office or to a station interface on a private branch exchange (PBX).
H323:Is a protocol used to communicate between CUCM and gateways to allow incoming and outgoing calls.
MGCP: is a protocol used to communicate between CUCM and gateways to allow incoming and outgoing calls. For more information , please find the below link:-
http://www.cisco.com/en/US/tech/tk1077/technologies_tech_note09186a00806fedbe.shtml
Thank you
please rate all useful information

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