Hi all!
Today we will consider one of the options for connecting Cisco Unified Communications Manager (hereinafter referred to as CUCM) to the Public Switch Telephony Network (or PSTN). This is usually done with the voice gateways. A voice gateway is a device that combines two different telephone networks together, for example, when connecting an VOIP network to a traditional telephony network.
As you know, gateways can communicate with CUCM using the following signaling protocols:
- H323;
- SIP;
- MGCP.