CUCM Endpoints

A variety of endpoints, from Cisco and third-party manufacturers, can be used with CUCM. Endpoints include IP phones, analog gateways, and video endpoints.

CUCM has widespread support for the following protocols to be used for endpoints: SCCP, SIP, and H.323. Figure 7-1 illustrates some of the various protocol options to connect to CUCM.

Figure 7-1 CUCM Endpoints

Figure 7-1 CUCM Endpoints

Voice Gateway

■ Type A phones: These are the following Cisco Unified IP Phones: 7905, 7912, 7940, and 7960.

■ Type B phones: These are the following Cisco Unified IP Phones: 7906, 7911, 7931, 7941, 7942, 7945, 7961, 7962, 7965, 7970, 7971, and 7975.

Cisco also offers software-based phones such as the older Cisco IP SoftPhone, Cisco IP Communicator (CIPC), and Cisco Unified Personal Communicator (CUPC). CIPC is a software-based version of the 7970 Cisco IP Phone. CIPC has always supported SCCP, and SIP support was added with CIPC 2.1. The CUPC requires a Cisco Unified Presence Server (CUPS) to register. The CUPS represents a UC client that operates as a phone, video device, and instant messenger client. CUPC can be used to promote a voice call into an audioconference, video call, or videoconference if the network has sufficient resources. All of this can be done while using CUPC to instant message different people.

The Cisco Unified IP Phone 7902 and Cisco Unified IP Phone 7910 models support SCCP only and are no longer being sold (End of Sale [EoS]).

The Cisco Unified IP Phone 7985 is a desktop video phone, whereas the Cisco Unified IP Phone 7920 and 7921 models are wireless LAN (WiFi) phones. The Cisco Unified IP Phone 7935,7936, and 7937 models are conference stations. The 7935 and 7936 endpoints support SCCP only.

NOTE The Cisco Unified IP Phone 7902, 7905, 7910, 7912, and 7935 are End of Sale (EoS). Cisco no longer sells these units, but it will continue to support them until the end of life (EoL) date.

Third-party products are available for most of the supported protocols. Nokia supports the Cisco Unified Mobile Communicator. Cisco Unified Mobile Communicator is a software client that is used on Nokia dual-mode mobile phones, allowing cellular PDA phones to register with CUCM. Tandberg and Sony produce various SCCP-enabled video endpoints, and IP blue offers an SCCP-based software IP phone that emulates standard Cisco 79xx phone lines. Many other third-party endpoints for SIP and H.323 can also be found on the market.

Endpoint Features

The features supported on the Cisco IP Phones vary by the device protocol in which the phone is running. The protocols can be categorized into three groups:

■ SCCP: SCCP is a Cisco proprietary protocol and is typically used only by Cisco IP endpoints. Third-party companies such as Sony, Tandberg, and VTGO (IP blue) have licensed SCCP. SCCP offers a rich set of telephony features that are supported on most Cisco handsets.

■ Third-party SIP or H.323: CUCM supports standards-based SIP and H.323 endpoints. The number of standardized telephony features, however, is limited when compared to the feature richness of SCCP.

■ SIP support for Cisco IP Phones: Cisco IP Phones using SIP support different features depending on which Cisco IP Phone is used. Many additional features are supported, compared to the SIP third-party phone support. Cisco SIP Type B phones support similar features when compared to those supported with SCCP. The number of features supported depends significantly on the Cisco IP Phone model being used.

Table 7-1 displays the support between various phone types and protocols. Third-party SIP and H.323 endpoints can be used with any other IP telephony devices or systems, including CUCM. Third-party SIP and H.323 are limited regarding the number of supported telephony features, when compared to Cisco SIP or SCCP IP Phones.

Table 7-1 Endpoint Support

Third-Party SIP

Cisco IP Phone SIP


Third-Party H.323

Third-Party PBX Support





Feature Support


Type A phones: Medium Type B phones: High



Supported Phones

Third party

Third-party SCCP phones

Third party

The Cisco Unified IP Phone models 7940 and 7960 can be loaded with a special firmware that provides RFC 3261 SIP support for third-party PBX systems. When these models interact with CUCM, both SIP and SCCP implementations provide more features than the phones operating on a third-party SIP proxy server. This option is used more by customers who connect to other IP communication systems but want to take advantage of the superior voice quality and look and feel of the Cisco IP Phones. Some Internet telephony service providers (ITSP) offering standard SIP telephony services provide their customers with preconfigured Cisco Unified IP Phone models 7940 or 7960 to be used to connect to their SIP proxy servers.

The Cisco Unified IP Phone models 7905 and 7912 can also be loaded with an H.323 firmware to be used with third-party PBX vendors using H.323.

Cisco IP Phones with SIP support a different number of features depending on whether the phone is a Type A or B model. Type A models include the 7905, 7912, 7940, and 7960. Type A phones support a large number of features but many fewer features than SCCP. The

Type A phones also have a different screen appearance when compared to their SCCP counterparts. Type B SIP phones support many more features than Type A SIP phones but do not have feature parity with their SCCP counterparts.

Cisco IP Phone Models

Cisco IP Phones range from entry-level phones employing a single directory number, oneway speakerphones, and no display to high-end phones with high-resolution, color, touchscreen displays and Gigabit Ethernet connectivity. Differences in hardware capabilities include the following:

■ Screen: Different models have screens with different resolution, size, color, and touchscreen capabilities.

■ Codec support: All Cisco IP Phones support G.711 and G.729 codecs. Most of the Cisco IP Phones support the Cisco wideband audio codec. All Type B phone models support the Internet low-bandwidth codec (iLBC) at 15.2 kbps, and G.722 wideband audio codec at 64 kbps. The G.722 audio codec requires a high-fidelity handset that ships only with the 79x2 and 79x5 phone models. Other Type B phones require a high-fidelity handset upgrade to support the G.722 audio codec.

■ LAN: Most Cisco IP Phones have a PC port so that a PC can be connected to the network without requiring its own switch port. Different phone models support different speeds on the PC and switch port of the IP phone.

■ Phone buttons: The number of IP phone buttons differs per phone model.

■ Speakerphone and headset support: Most Cisco IP Phones offer speakerphone and headset support.

■ Number of lines: The number of lines varies per phone model from one to eight. Twenty-eight lines can be added to most of the phones with the purchase of two 7914 sidecar modules.

■ Other features: Some IP phones provide other special features such as video, WiFi support, or dedicated support for use in conference rooms. The 7936 and 7937 phones support external microphones to provide coverage to large conference rooms.

Entry-Level Cisco IP Phones

The Cisco Unified IP Phone models 7906 and 7911 fill the communication needs of cubicle, retail, classroom, or manufacturing. These phones are satisfactory to users conducting low to moderate telephone traffic without use of advanced features. Four dynamic soft keys guide users through core business features and functions, while a pixel-based display combines intuitive features, calling information, and Extensible Markup Language (XML) services allowing IP phone service applications.

The Type B entry-level phones mentioned support security features, including encrypted signaling and media. Encrypted voice traffic and security concepts are covered in Cisco Unified Communications IP Telephony, Part 2. All Type B entry-level phones support IEEE 802.3af Power over Ethernet (PoE), Cisco in-line power, or local power through an optional power adapter.

Midrange Cisco IP Phones

Midrange Cisco Unified IP Phones (7940, 7941, 7942, 7960, 7961, and 7962 models) address the communications needs of those that make frequent use of the phone system. Users providing a majority of their business services through telephone communications normally require a phone with more features than the entry-level phones. They provide a high-quality speakerphone and four dynamic soft keys that guide users through call features and functions. A built-in headset port and an integrated Ethernet switch are standard with these phones. The phones also include audio controls for the full-duplex, high-quality, hands-free speakerphone, handset, and headset.

All Type B phone models have LED-based line keys that allow call states to be represented by different colors. These phones also support the iLBC and G.722 audio codecs.

NOTE For a detailed list of features per phone model, see the data sheets for the Cisco Unified IP Phone 7900 series products.

High-End Cisco IP Phones

High-end Cisco Unified IP Phones include the 7945, 7965, 7970, 7971, and 7975 models. These phones demonstrate the latest advances in Unified Communications technology, including G.722 wideband audio support, backlit color display, and an integrated Gigabit Ethernet chipset. They address the needs of executives and managers with significant phone traffic.

All Cisco IP Phones include a display for easy access to communication information, date and time display, calling party name and number, called party name and number, and presence information. The Cisco IP Phones also accommodate XML applications that take advantage of the display. The phones provide direct access to two to eight telephone lines (or a combination of lines, speed dials, and direct access to telephony features), four or five interactive soft keys that guide you through call features and functions, and an intuitive four-way (plus Select key) navigation cluster. A hands-free speakerphone and handset designed for high-fidelity wideband audio are standard, as is a built-in headset connection. XML and presence are covered in more detail in later chapters.

Other Cisco IP Phones

Other Cisco Unified IP Phones and endpoints include the following models:

■ Cisco Unified IP Phone 7985: The 7985 is a personal desktop video phone for the Cisco UC solution. The Cisco Unified IP Phone 7985 offers executives and managers a productivity-enhancing video phone that enables instant, face-to-face communication between physically disparate locations. The 7985 contains a video camera, LCD screen, speaker, keypad, and handset incorporated into one easy-to-use unit.

■ Cisco Unified IP Conference Station 7936: This conference station combines speakerphone conferencing technologies with Cisco voice communication technologies. The 7936 is an IP-based, hands-free conference station. The new Cisco Unified IP Conference Station 7937 is a Cisco-designed conference room solution that has a much newer look and feel compared to the 7936 phone based on Polycom technology.

■ Cisco Unified Wireless IP Phone 7921: This phone provides a solution with an intelligent wireless infrastructure. This wireless phone supports a host of calling features and voice-quality enhancements. Because the Cisco Unified Wireless IP Phone 7921 is designed to grow with system capabilities, features will keep pace with new system enhancements. The 7921 is an 802.11g WLAN phone that supports XML applications and extension mobility. The older 7920 WLAN phone did not support XML applications or extension mobility and was limited to 802.11b wireless support.

■ Cisco Unified IP Phone 7931: The 7931 phone meets the communication needs of retail, commercial, and manufacturing workers, and anyone with moderate telephone traffic but specific call requirements. Dedicated hold, redial, and transfer keys facilitate call handling in a retail environment. Illuminated mute and speakerphone keys give a clear indication of speaker status. A pixel-based display with a white backlight makes calling information easy to see and delivers a large number of physical buttons that can be used for lines and speed dials.

Cisco IP Phones integrate seamlessly into a Cisco Unified network infrastructure. Cisco IP

Phones provide the following network-related features:

■ Cisco Discovery Protocol Version 2(CDP): Cisco IP Phones generate CDPv2 messages, common in most other Cisco network products. Cisco IP Phones listen for CDP announcements sent out by Cisco Catalyst switches and desktop PCs. With CDP, a Cisco Catalyst switch can configure the phone's voice VLAN. CDP is also useful for tracking telephony devices when 911 is called. Cisco Emergency Responder is an enhanced 911 server that finds mobile users in a dynamic work environment. The Cisco Emergency Responder server is notified by CUCM when there is a new phone registration in the cluster. Cisco Emergency Responder contacts the switches and routers to physically find the device. CDP announcements from the IP phone and IP Communicator make this discovery process viable. The Cisco Unified Video Advantage client also uses CDP to associate the video-enabled PC to the IP phone. Cisco Unified Video Advantage is covered later in this book.

■ DHCP: Cisco IP Phones can have static IP configurations entered at the IP phone or dynamic IP addresses assigned from a DHCP server.

■ MAC address-based device identification: Cisco IP Phones are identified by the burned-in MAC address of the IP phone. This allows the device to be moved between subnets and simplifies DHCP configuration because no specific IP address is required for an individual phone.

■ TFTP: Cisco IP Phone configurations are downloaded from the TFTP server component in CUCM. CUCM dynamically generates device-specific configuration files and makes them available for download at one or more TFTP servers. Cisco IP Phones obtain the IP address of the TFTP server via DHCP (option 150) and load the appropriate configuration file based on the MAC address. A phone with a MAC address of 012345012345 will request a configuration file of 012345012345.cnf.xml from the TFTP server. All configuration files are based on the XML programming language.

■ PoE: Cisco IP Phones do not require wall power. The phones obtain power over Ethernet from a PoE-compliant LAN switch. Various Cisco Catalyst switches provide Power over Ethernet in different capacities. The older Catalyst switches with power support provide Cisco power only, whereas the newer switches provide both IEEE 802.3af and Cisco power. PoE eliminates the need for extra power adapters and cabling at user workspaces. It also allows power backup in a centralized location in situations where the phone system must be operational during a power outage.

■ PC port: Cisco IP Phones allow PCs to be connected to a PC port at the IP phone and then share the uplink toward the switch. The voice VLAN feature of Cisco Catalyst switches separates the phone and PC traffic into different VLANs on a single access port at the LAN switch.

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