NEW Cisco Routers! ISR G2

Cisco announced the new Cisco ISR G2 routers today (integrated services router - second generation). This blog interrupts the SRST blog series, but I will get back to that conversation very soon. We will take a look at the ISR G2...

Survivable Remote Site Telephony

In this blog, we will investigate redirected dialed number identification service (RDNIS) to aid our understanding of the requirement when forwarding calls from a branch site location to a centralized voicemail solution when the WAN...

Survivable Remote Site Telephony

In this blog, we will discuss SRST voicemail capabilities. The information in this blog assumes some information from previous blog postings on SRST. This SRST blog is the eighth SRST post in the SRST blog series. During...

Survivable Remote Site Telephony

This blog will continue the SRST conversation that we have been having over the last six blogs. During normal operation, most implementations of Cisco Unified Communications Manager (CUCM) provide a secondary (stutter) dial tone...

SRST

In this blog, we will continue discussing more configuration options available in Survivable Remote Site Telephony (SRST). All of the configuration command examples in this blog are configured in call-manager-fallback...

Survivable Remote Site Telephony

In this blog, we will discuss SRST in more detail. Remote site MGCP gateways must be provisioned with MGCP fallback to route calls to and from the PSTN when the MGCP call agent (CUCM) is unreachable. This blog will cover the...

Survivable Remote Site Telephony

The following configuration example is a simple Survivable Remote Site Telephony (SRST) configuration: Router(config)#call-manager-fallback Router(config-cm-fallback)#ip source address 10.1.1.1 port...

MGCP Fallback and H.323 Call Preservation

MGCP gateways that lose connectivity to their primary Cisco Unified Communications Manager (CUCM) support call survivability by default, but the MGCP gateway cannot be used for any new inbound or outbound calls during a CUCM outage....

Survivable Remote Site Telephony part 2

This blog will discuss the Cisco SRST conversation that was started in the last blog. After a Cisco IP phones registers to the Cisco SRST gateway, the Cisco IP phones will continue to send keep alive messages to the primary Cisco...

Survivable Remote Site Telephony

Survivable Remote Site Telephony (SRST) is a Cisco Unified Communications Manager (CUCM) call processing backup mechanism that allows Cisco IP phones to register to a Cisco router. A Cisco router in SRST mode provides call setup...

Cisco UC and Network Time Protocol

Network time protocol (NTP) is a mechanism used to synchronize the date and time over IP based networks. Cisco Unified Communications platforms have a built in NTP client to ensure the proper date and time on the Cisco IP phones...

Subscribe CSS and Presence

Cisco Unified Communications Manager (CUCM) 5.0 introduced presence support. Presence is similar to the busy station select, busy lamp field functionality used in some traditional PBX system. Standards based presence information...

AAR Calling Search Space

An AAR calling search space (CSS) is a special application of calling search spaces that can be applied at the line (directory number) level of Cisco IP phone configuration. This blog will discuss automated alternate routing (AAR)...

Voicemail Integration Configuration of Calling Search Spaces and Partitions

In this blog, we will take a look at the class of service (CoS) requirements for integrating a voice mail solution with Cisco Unified Communications Manager (CUCM). The integration of the voicemail system includes a number of...

Class of Service

A directory number (DN) configuration include various call forwarding operations which can be restricted using calling search that are different than those used at the directory number of phone configuration levels. If a calling...

Class of Service

In this blog I will discuss the line/device class of service (CoS) approach. The traditional calling search space approach covered in previous blogs is adequate for a small deployment involving a small number of sites. The...

Class of Service

In this blog we will continue our Cisco Unified Communications Manager (CUCM) class of service (CoS) implementation using calling search spaces (CSS) and partitions (PT). In the last blog, we covered an example of outbound call...

Class of Service

In this blog, we will take a look at Class of Service (CoS) examples to gain a better understanding of how traditional calling search spaces (CSS) and partitions (PT) work in Cisco Unified Communications Manager (CUCM). Phone A...

Class of Service

In this blog we will investigate the configuration of calling search spaces (CSS) in Cisco Unified Communications Manager (CUCM). Four calling search spaces will be discussed as outlined two blogs ago. We will be creating...

Class of Service

Partitions and calling search spaces (CSS) are used in Cisco Unified Communications Manager (CUCM) to implement class of service. Partitions are used to logically segment the dial plan. All phone numbers are placed in the...

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