call control protocols over which technology ?

[fran19422]

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.

[paolo bevilacqua · Accepted solution]

ISDN uses Q.931

FXO no real protocol, as it is the traditional phone interface of about 100 year old.

[fran19422]

OK thanks.

Is or can MGCP/H323 be used over an ISDN connection ?

Thanks for clarification.

[Jason Lee · Accepted solution]

H323 and MGCP are signaling protocols used by the voice gateway to communicate information about activity on the PSTN connections back to CUCM for call setup.

Sent from Cisco Technical Support iPad App

[islam.kamal · Accepted solution]

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

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