Voice Over IP

Unified Messaging Cisco Unity is designed for an IP environment and complements the full range of IP communications solutions (for example, Cisco Unified CallManager, Cisco Personal Assistant, and Cisco IP Contact Center). Cisco Unity provides advanced capabilities that unify data and ... [full story]

Contact Centers Contact centers are the hubs of the customer service efforts of many growing businesses. Forward-thinking companies are integrating this key function with Internet technology to transform customer care into a powerful business-building force. Firms such as catalog sellers, telemarketers, and ... [full story]

Voice-Enabled Web Applications Cisco AS5400 Series Universal Gateways can interpret Voice Extensible Markup Language (VoiceXML) documents. VoiceXML is an open-standard markup language that creates voice-enabled web browsers and IVR applications. While HTML enables users to retrieve data with a PC, VoiceXML ... [full story]

Collaborative Computing Collaborative computing allows team members on a shared project to share resources and applications in real time, regardless of their physical location. Figure B-9 illustrates a simple VoIP internetwork that allows collaborative computing. The PSTN serves as a gateway ... [full story]

Computer Telephony Integration Computer telephony integration (CTI) enables access to computer-processing functions while making, receiving, and managing telephone calls. CTI applications allow users to perform tasks such as retrieving customer information from a database provided by the caller ID. CTI applications ... [full story]

Prepaid Calling Card Prepaid and postpaid calling-card services represent one of the fastest-growing types of enhanced voice services. A variety of consumer segments have propelled the growth of these services, including students, business and leisure travelers, and immigrants. They are especially ... [full story]

Multitenant Multitenant applications, as depicted in Figure B-6, allow building owners to deploy low-cost services such as VoIP, cable television, and IP data services to tenants in a common campus or building. Figure B-6. Multitenant Applications Candidates for multitenant applications include the ... [full story]

IP Centrex Centrex service is regarded as an "outsourcing" of telephony call services. Centrex does not maintain a PBX on customer premises. Instead, Centrex service removes the PBX function from the customer premises, provides a Centrex trunk to the customer, and ... [full story]

Hospitality Network Hospitality enterprises (for example, hotels, airports, and convention centers) host guests who demand high-speed connections to the Internet and access to telephony services. Enterprises that are used by a large number of travelers spend money to support LAN-like performance ... [full story]

Toll Bypass Toll bypass allows customers to bypass the PSTN. The PSTN consists of the tandem time-division multiplexing (TDM)based switches used for long-distance (or toll) voice calls. Enterprise customers who typically depend on the PSTN for their interoffice voice traffic avoid ... [full story]

Cisco Unified CallManager Cisco's IP Communications product line, including IP telephony, unified communication, audio/video conferencing, and customer contact applications, helps organizations realize business gains by improving operational efficiencies. These improved operational efficiencies result in increased organizational productivity and enhanced customer satisfaction. Cisco ... [full story]

Hoot and Holler A hoot and holler network, as illustrated in Figure B-1 (also known as a junkyard circuit, squawk box system, holler down circuit, or shout down circuit), provides always-on multiuser conferences without requiring users to dial in to a ... [full story]

Suggested Solution Although your physical hardware might differ, Example 7-7 shows the output of the show auto qos command on R2 after entering the auto qos voip command for interfaces Serial 0/0 and Serial 0/1. Notice that cRTP and MLP are ... [full story]

Configure AutoQoS on the Faster Interface In this task, you will configure AutoQoS on router R2's faster serial interface. Complete these steps: Step 1. Enter interface configuration mode on router R2 for the interface that connects R2 to router R3 (for example, interface Serial ... [full story]

Configure AutoQoS on the Slower Interface In this task, you will configure AutoQoS on router R2's slower serial interface. Complete these steps: Step 1. Enter interface configuration mode on router R2 for the interface that connects R2 to router R1 (for example, interface Serial ... [full story]

Router AutoQoS In this lab, you will configure AutoQoS on two different router interfaces. One interface runs at a speed of 128 kbps, and the other interface runs at a speed of 2 Mbps. You will see that AutoQoS treats these ... [full story]

Cisco Unified CallManager CAC While Cisco supports a variety of CAC mechanisms, most of these mechanisms are router-centric. However, in environments containing multiple Cisco Unified CallManager (CCM) clusters, other CAC approaches might be more appropriate. With CCMs, two types of call ... [full story]

MGCP CAC Configuration version 12.2 ! ! Output omitted for brevity ! ! The following command is used in MGCP SA Agent CAC. call fallback active ! The following command is used in MGCP RSVP CAC. call rsvp-sync ! The following ... [full story]

Configuring Cisco SAA CAC Cisco SAA is an application-aware synthetic operation agent that monitors network performance by measuring response time, network resource availability, application performance, jitter (interpacket delay variance), connect time, throughput, and packet loss. Performance can be measured between any ... [full story]

Configuring RSVP CAC To configure MGCP RSVP CAC on a media gateway, use the following command in global configuration mode: ip rsvp bandwidth (interface-kbps [single-flow-kbps]) This command enables RSVP for IP on an interface. RSVP is disabled by default. It should be ... [full story]

MGCP CAC The MGCP VoIP CAC feature enables certain Cisco CAC capabilities on VoIP networks that are managed by MGCP call agents. These capabilities permit a gateway to identify and gracefully refuse calls that are susceptible to poor voice quality. Poor voice ... [full story]

Configuring Resource Availability Check User-selected thresholds allow you to configure call admission thresholds for local resources and end-to-end memory and CPU resources. You can configure two thresholds, high and low, for each global or interface-related resource. The specified call treatment is ... [full story]

Configuring PSTN Fallback The measurement-based CAC for SIP feature supports PSTN Fallback, which monitors congestion in the IP network and either redirects calls to the PSTN or rejects calls based on network congestion. Calls can be rerouted to an alternate IP ... [full story]

Configuring SAA RTR Responder Service Assurance Agent (SAA) is a generic network management feature that provides a mechanism for network congestion analysis. SAA determines latency, delay, and jitter and provides real-time ITU Calculated Planning Impairment Factor (ICPIF) calculations before establishing a ... [full story]

ISDN Cause Codes Cause No. Description Function 34 No circuit available (circuit/channel congestion) Indicates that there is no channel available to handle the call 38 Net out of order Indicates that the network is not functioning properly and the malfunction is likely to last a long time. Re-attempting the ... [full story]

call treatment Commands Command Description on Enables call treatment from the default session application. action action Action to take when call treatment is triggered. The action argument has the following possible values: hairpinHairpin playmsgSpecifies the URL of the audio file to play rejectDisconnects the call and pass down cause code cause-code ... [full story]

H.323 CAC The CAC for the H.323 VoIP gateways feature allows you to configure thresholds for local resources, memory, and CPU resources. With the call threshold command, you can configure two thresholds, high and low, for each resource. Call treatment is ... [full story]

CAC Tools As the various aspects of CAC on IP networks have been considered, several different solutions have come into prominence. None of them solves the entire problem, but they all are useful to address a particular aspect of CAC. Unlike ... [full story]

RSVP RSVP is the only CAC mechanism that makes actual bandwidth reservations for calls. RSVP offers the unique advantage of not only providing CAC for voice but also guarantees the QoS against changing network conditions for the duration of the call. ... [full story]

CAC Operation CAC can function on the outgoing gateway and base its decision on nodal information, such as the state of the outgoing LAN or WAN link. For example, if the local IP network link is down, there is no point ... [full story]

Implementing Call Admission Control To prevent oversubscription of VoIP networks, the number of voice calls allowed on the network must be limited. This section describes the configuration parameters for implementing CAC, which can prevent oversubscription of WAN resources. Effects of Bandwidth Oversubscription QoS ... [full story]

Configuring AutoQoS on a Catalyst Switch The QoS mechanisms on a Catalyst switch differ from those QoS mechanisms found on a router. For example, while a router uses LLQ as a priority queuing strategy, a Catalyst switch might use weighted round-robin ... [full story]