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CHAPTER
55
Configuring a VoIP Network
This chapter describes how to configure a Voice-over-IP (VoIP) network on the Catalyst 6500 series
switches.
Note While this chapter introduces a number of Cisco networking products that are related to VoIP, the
primary focus of the chapter is to provide configuration information for integrating the Catalyst 6500
series products into your VoIP network.
Note For complete syntax and usage information for the commands that are used in this chapter, refer t
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Chapter 55 Configuring a VoIP Network Understanding How a VoIP Network Works Understanding How a VoIP Network Works A telephony system built on an IP network instead of the traditional circuit-switched private branch exchange (PBX) network is called an IP PBX system. (See Figure 55-1.) The system’s components are described in these sections: Cisco IP Phone 7960, page 55-2 Cisco CallManager, page 55-5 Access Gateways, page 55-5 How a Call Is Made, page 55-8 Figure 55-1 IP PBX Sys
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Chapter 55 Configuring a VoIP Network Understanding How a VoIP Network Works The IP phone is Dynamic Host Configuration Protocol (DHCP) capable. Optionally, you can program the IP phone with a static IP address. The IP phone can be powered by the following sources: External power source—Optional transformer and power cord for connecting to a standard wall receptacle. Ethernet switching modules with the voice daughter card installed—Provides the inline power to the IP phone. WS-P
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Chapter 55 Configuring a VoIP Network Understanding How a VoIP Network Works Figure 55-2 Connecting the Cisco IP Phone 7960 to the Catalyst 6500 Series Switch 10/100BASE-TX Module * IP phone (Example 1) (WS-X6348-RJ45V) 10/100BASE-TX Module * PC (Example 2) (WS-X6348-RJ45V) 10/100BASE-TX Module * IP phone PC (Example 3) (WS-X6348-RJ45V) 10/100BASE-TX Module * IP phone IP phone PC (Example 4) (WS-X6348-RJ45V) * Gigabit Ethernet Module with Inline power daughter card (WS-6548-GE-TX + WS-F6
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Chapter 55 Configuring a VoIP Network Understanding How a VoIP Network Works Cisco CallManager Cisco CallManager is an open and industry-standard call processing system; its software runs on a Windows NT server and sets up and tears down the calls between the phones, integrating traditional PBX functionality with the corporate IP network. Cisco CallManager manages the components of the IP PBX system, the phones, the access gateways, and the resources for such features as call conferenc
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Chapter 55 Configuring a VoIP Network Understanding How a VoIP Network Works Table 55-1 24-Port FXS Analog Interface Module Features (continued) Digital Signal Processing Per Port Line echo cancellation (32 ms) Impedance (600 ohms) Programmable analog gain, signaling timers Fax pass-through 2 SPAN or port mirroring support FXS Interface Features Address signaling formats: In-band DTMF Signaling formats: Loop start Ringing tone: Programmable Ringing voltage: Programmable, based on country
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Chapter 55 Configuring a VoIP Network Understanding How a VoIP Network Works Table 55-2 8-Port T1/E1 PSTN Interface Module Features Digital Signal Processing Per T1/E1 Port G.711 to G.723 and G.729a transcoding (maximum of 8 x 32 channels of transcoding) Conference bridging, meet-me, and ad-hoc conference modes (maximum of 8 x 16 channels of conferencing) Comfort noise generation Fax pass-through Silence suppression, voice activity detection Line echo cancellation Common channel signalin
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Chapter 55 Configuring a VoIP Network Understanding How VLANs Work One or two T1 digital ports for connecting to the following: – PSTN using FXO emulation – T1 channel bank using FXS emulation – PBX through a trunk (tie) line using ear and mouth (E&M) emulation These ports can be used to integrate a VoIP network with POTS devices, PBXs, or the PSTN. To configure the Cisco VG200, refer to the documentation that shipped with the gateway. How a Call Is Made An IP phone connects to a LAN ei
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Chapter 55 Configuring a VoIP Network Understanding How VLANs Work Note For more information about the VLANs, see Chapter 11, “Configuring VLANs.” Figure 55-3 shows how to connect a Cisco IP Phone 7960 to a Catalyst 6500 series switch. Figure 55-3 Switch-to-Phone Connections Cisco IP Phone 7960 Phone ASIC Catalyst switch Workstation/PC P2 3-port P1 P3 10/100 module switch Access port When the IP phone connects to a 10/100 port on the Catalyst 6500 series switch, the access port (PC-to-ph
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Chapter 55 Configuring a VoIP Network Understanding How CDP and VoIP Work Understanding How CDP and VoIP Work Cisco Discovery Protocol (CDP) was enhanced in software release 8.1(1) to facilitate backward compatibility with the newer, higher-powered Cisco IP phones. With this enhanced CDP, a Cisco IP phone can negotiate its power requirements to the switch within the CDP packet. The switch uses this information to ensure that it does not oversubscribe the available power. We recommend t
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Chapter 55 Configuring a VoIP Network Configuring VoIP on a Switch Table 55-3 Voice-Related CLI Command Module and Platform Support (continued) 1 2 3 CLI Commands Ethernet Module WS-X6608-T1/E1 WS-X6624-FXS show environment power XXX Voice-related commands set port auxiliaryvlan X/X show port auxiliaryvlan X/X set port voice interface XX show port voice interface XX show port voice XXX show port voice fdl X show port voice active XXX QoS commands related to voice set port qos mod/port cos
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Chapter 55 Configuring a VoIP Network Configuring VoIP on a Switch This section describes the following topics: Using show Commands to Display Module Type and Version Information, page 55-12 Power Management Modes, page 55-13 Phone Detection Summary, page 55-16 Setting the Power Mode of a Port or a Group of Ports, page 55-17 Setting the Default Power Allocation, page 55-17 Setting the Inline Power Notification Threshold for a Module, page 55-18 Displaying the Power Status fo
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Chapter 55 Configuring a VoIP Network Configuring VoIP on a Switch Mod Sub-Type Sub-Model Sub-Serial Sub-Hw Sub-Sw --- ----------------------- ------------------- ----------- ------ ------ 1 L3 Switching Engine II WS-F6K-PFC2 SAD044302EA 1.0 3 IEEE InlinePower Module WS-F6K-FE48-AF sasdfasdf 0.1 8.1(0) 6 Inline Power Module WS-F6K-VPWR-GE SAD070700GV 0.201 8.1(0) Console> (enable) To display the module and submodule versions, perform
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Chapter 55 Configuring a VoIP Network Configuring VoIP on a Switch Each port also has a status that is defined as one of the following: on—Power is supplied by the port. off—Power is not supplied by the port. Power-deny—The supervisor engine does not have enough power to allocate to the port, or the power that is configured for the port is less than the power that is required by the port; the power is not being supplied by the port. err-disable—The port is unable to provide the
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Chapter 55 Configuring a VoIP Network Configuring VoIP on a Switch Available Power Table 55-5 lists the available power that can be supplied for each port for the voice daughter cards. Table 55-5 Efficiency of Voice Daughter Cards Maximum Power Daughter Card Per Port (W) Efficiency WS-F6K-PWR 6.3 100% WS-F6K-VPWR-GE 6.3 89% WS-F6K-GE48-AF 15 89% WS-F6K-FE48-AF 15 89% WS-F6K-FE96-AF 15 89% For example, if the powered device requires 6.3 W, then the allotted power for that port using a d
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Chapter 55 Configuring a VoIP Network Configuring VoIP on a Switch High-Availability Support To support high availability during a failover from the active supervisor engine to the standby supervisor engine, the per-port power management and phone status information is synchronized between the active and standby supervisor engines. The information to be synchronized (on a per-port basis) is the presence of a phone, the phone power status (on, off, denied, or faulty), allocated power,
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Chapter 55 Configuring a VoIP Network Configuring VoIP on a Switch Setting the Power Mode of a Port or a Group of Ports To set the power mode of a port or a group of ports, perform this task in normal mode: Task Command Set the power mode of a port or a group of ports. set port inlinepower mod/port {[auto | static] [max-wattage] | off} Note If you configure the max-wattage values that are multiples of 500 on a Catalyst 6500 series switch with the set port inlinepower mod/port static | a
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Chapter 55 Configuring a VoIP Network Configuring VoIP on a Switch This example shows how to set the default power allocation: Console> (enable) set inlinepower defaultallocation 9500 Default inline power allocation set to 9500 mWatt per applicable port. Console> (enable) Setting the Inline Power Notification Threshold for a Module Use the set inlinepower notify-threshold command to set a threshold for inline power usage. The threshold is a percentage from 1 through 99, with 99 percent b
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Chapter 55 Configuring a VoIP Network Configuring VoIP on a Switch This example shows how to display the detailed power status for the modules and individual ports: Console> show port inlinepower 4/1 detail Configured Default Inline Power allocation per port: 15.400 Watts (0.36 Amps @42V) Total inline power drawn by module 4: 33.934 Watts ( 0.807 Amps @42V) Port InlinePowered PowerAllocated Device IEEE class DiscoverMode From PS To PD Ad
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Chapter 55 Configuring a VoIP Network Configuring VoIP on a Switch Slot Inline Power Requirement/Usage : Slot CardType Total Allocated Max H/W Supported Max H/W Supported To Module (Watts) Per Module (Watts) Per Port (Watts) ---- ------------------- ----------------- ------------------ ---------------- 3 WS-X6548-RJ-45 31.08 315.84 15.400 6 WS-X6148-GE-TX 26.46 315.84 7.000 Console> (ena
