Most businesses that deal with the public have a need, from time to time, to block certain calls from coming into the network. For example, you may have a former customer making threatening calls to your office. There are a few ways to handle this problem. Option 1  —  H.323 and SIP Gateways If you have an H.323 gateway, […]

I recently worked on a project involving a centralized four-site Unified Communications Manager (UCM) deployment. With any centralized deployment, it’s important to provide call processing redundancy at the remote sites. No doubt many, if not most, readers know Survivable Remote Site Telephony (SRST) provides this functionality. During the startup process, the phone downloads a configuration […]

This dial-peer discussion is to address dial-peers in order to establish call-legs. On each gateway, we will capture an inbound call using a dial-peer whether the inbound call leg is POTS or VOIP and then focus on extending that call by using a dial-peer to establish an outbound dial-peer. For this discussion, we will be […]

Last post we looked at dial-peers and the syntax that is needed to address endpoints.  In this segment I want to explore the concept of creating destination-pattern that would be used on H.323 or SIP gateways to forward a call out of a POTS (Plain old Telephone System) port to the PSTN.  In order to […]

Cisco Unified Communication H.323 and SIP gateways will require a dial plan on those gateways to extend calls to endpoints that may be configured. An endpoint may be either an analog or digital voice port that would provide connections to the public switch telephone (PSTN) network or to traditional private branch exchange (PBX) phone switches. […]