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Cisco High-Density Analog Voice and Fax
Network Module
Feature History
Release Modification
12.2(2)XT These features were implemented on the Cisco 2600 series, Cisco
3640 and the Cisco 3660 router.
12.2(8)T This feature was integrated into Cisco IOS Release 12.2(8)T.
This document describes the Cisco High-Density Analog Voice and Fax Network Module (NM-HDA)
in Cisco IOS Release 12.2(8)T. This document includes the following sections:
• Feature Overview, page 2
� Supported Platforms, page 9
�
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Cisco High-Density Analog Voice and Fax Network Module Feature Overview Feature Overview The Cisco High-Density Analog Voice and Fax Network Module provides DTMF detection, voice compression and decompression, call progress tone generation, voice activity detection (VAD), echo cancellation, and adaptive jitter buffering for up to 16 ports. The following port combinations are supported: � Twelve Foreign Exchange Station (FXS) ports � Eight Foreign Exchange Office (FXO) ports and four FXS
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Cisco High-Density Analog Voice and Fax Network Module Feature Overview Telephony Signaling Interfaces Voice ports on routers and access servers physically connect the router or access server to telephony devices such as telephones, fax machines, PBXs, and (PSTN) central office (CO) switches. These devices may use any of several types of signaling interfaces to generate information about on-hook status, ringing, and line seizure. The router’s voice-port hardware and software must be co
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Cisco High-Density Analog Voice and Fax Network Module Feature Overview FXO and FXS interfaces indicate on-hook or off-hook status and the seizure of telephone lines by one of two access signaling methods: loop start or ground start. The type of access signaling is determined by the type of service from the CO; standard home telephone lines use loop start, but business telephones can order ground start lines instead. Loop-start is the more common of the access signaling techniques. Whe
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Cisco High-Density Analog Voice and Fax Network Module Feature Overview Supervisory tone disconnect occurs when the connected switch provides a special tone to indicate a change in call state. Some PBXs and PSTN CO switches provide a 600-millisecond interruption of line power as a supervisory disconnect, and others provide supervisory tone disconnect (STD). This is the signal that the router is looking for when the no supervisory disconnect command is configured on the voice port. Note
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Cisco High-Density Analog Voice and Fax Network Module Feature Overview Several different types of delay combine to make up the total end-to-end delay associated with voice calls: � Propagation delay—Amount of time it takes the data to physically travel over the media. � Handling delay—Amount of time it takes to process data by adding headers, taking samples, forming packets, and so on. � Queuing delay—Amount of time lost due to congestion. � Variable delay or jitter—Amount of time that
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Cisco High-Density Analog Voice and Fax Network Module Feature Overview Normally, the defaults in effect are sufficient for most networks. However, a small playout delay from the jitter buffer can cause lost packets and choppy audio, and a large playout delay can cause unacceptably high overall end-to-end delay. Note Prior to Cisco IOS Release 12.1(5)T, playout delay was configured in voice-port configuration mode. For Cisco IOS Release 12.1(5)T and later releases, in most cases, playo
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Cisco High-Density Analog Voice and Fax Network Module Feature Overview Restrictions The following features not supported at this time: � ATM SVC � SAS signaling Supported High-Complexity Codecs � G.711 a-law � G.711 u-law � G.723.1 ANNEX-A 5300 bps � G.723.1 ANNEX-A 6300 bps � G.723.1 5300 bps � G.723.1 6300 bps � G.726 16000 bps � G.726 24000 bps � G.726 32000 bps � G.728 16000 bps � G.729 ANNEX-B 8000 bps � G.729 8000 bps � GSMFR 13200 bps Supported Medium-Complexity Codecs: � G.726 1
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Cisco High-Density Analog Voice and Fax Network Module Supported Platforms Related Documents For information about installing voice network modules and voice interface cards in Cisco 2600 series, Cisco 3640 and Cisco 3660 routers, see these publications: � Cisco 2600 Series Hardware Installation Guide � Cisco 3620 and Cisco 3640 Modular Access Routers Quick Start Guide � Cisco 3600 Series Hardware Installation Guide � Update to the Cisco Network Module Hardware Installation Guide � WAN I
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Cisco High-Density Analog Voice and Fax Network Module Supported Standards, MIBs, and RFCs Table 2 lists the hardware platforms that support this feature, and the releases in which the feature was first supported. If the First T train Release column is blank, the feature is not yet available in a Cisco IOS T release on that platform. Table 2 Cisco IOS Release and Platform Support for this Feature Platform 12.2(2)XT 12.2(8)T Cisco 2600 series X X Cisco 3640 X X Cisco 3660 X X Supported St
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Cisco High-Density Analog Voice and Fax Network Module Configuration Tasks Configuration Tasks See the following sections for configuration tasks for this feature. � Configuring Analog FXO and FXS Voice Ports (required) � Configuring Voice Activity Detection (VAD) (optional) � Fine-Tuning Analog Voice Ports (optional) � Verifying Analog Voice-Port Configurations (optional) Configuring Analog FXO and FXS Voice Ports To configure basic analog voice port parameters on Cisco 2600 series, Cisco
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Cisco High-Density Analog Voice and Fax Network Module Configuration Tasks Command Purpose Router(config-voiceport)# ring frequency {25 | 50} Step 4 (FXS only) Selects the ring frequency, in hertz (HZ), used on the FXS interface. This number must match the connected telephony equipment and may be country-dependent. If not set properly, the attached telephony device may not ring or it may buzz. The keyword default is 25 on Cisco 2600 series, Cisco 3640 and Cisco 3660 routers. Step 5 R
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Cisco High-Density Analog Voice and Fax Network Module Configuration Tasks Configuring Voice Activity Detection (VAD) Voice activity detection (VAD) is configured on dial peers; by default it is enabled. For more information, see the “Configuring Dial Plans, Dial Peers, and Digit Manipulation” chapter in the Cisco IOS Release 12.2 Voice, Video, and Fax Configuration Guide, Release 12.2. Two parameters associated with VAD, music threshold and comfort noise, are configured on voice ports.
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Cisco High-Density Analog Voice and Fax Network Module Configuration Tasks Configuring Disconnect Supervision Commands PBX and PSTN switches use several different methods to indicate that a call should be disconnected because one or both parties have hung up. The commands in this section are used to configure the router to recognize the type of signaling in use by the PBX or PSTN switch connected to the voice port. These methods include the following: � Battery reversal disconnect � Bat
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Cisco High-Density Analog Voice and Fax Network Module Configuration Tasks To change parameters related to disconnect supervision, use the following commands as appropriate, in voice-port configuration mode: Command Purpose Router(config-voiceport)# battery-reversal Step 1 Enables battery reversal. The default is that battery reversal is enabled. � For FXO ports—Use the no battery-reversal command to configure a loop-start voice port to not disconnect when it detects a second battery r
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Cisco High-Density Analog Voice and Fax Network Module Configuration Tasks Configuring FXO Supervisory Disconnect Tone Commands To create a voice class that defines the specific tone or tones to be detected and then apply the voice class to the voice port, use the following commands beginning in global configuration mode: Command Purpose Step 1 Router(config)# voice class dualtone tag Creates a voice class for defining one tone detection pattern. The range for the tag number is from 1 t
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Cisco High-Density Analog Voice and Fax Network Module Configuration Tasks Command Purpose Router(config-voice-class)# cadence-list cadence-id Step 10 (Optional) Specifies a tone cadence pattern to be cycle-1-on-time cycle-1-off-time cycle-2-on-time detected. Specify an on time and off time for each cycle-2-off-time cycle-3-on-time cycle-3-off-time cycle of the cadence pattern. cycle-4-on-time cycle-4-off-time The arguments are as follows: � cadence-id—Ranges from 1 to 10. There is no
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Cisco High-Density Analog Voice and Fax Network Module Configuration Tasks Configuring Timeouts Commands To change timeouts parameters, use the following commands as appropriate, in voice-port configuration mode: Command Purpose Step 1 Router(config-voiceport)# timeouts call-disconnect Configures the call disconnect timeout value in seconds seconds. Valid entries range from 0 to 120. The default is 60. Router(config-voiceport)# timeouts initial seconds Step 2 Sets the number of seconds
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Cisco High-Density Analog Voice and Fax Network Module Configuration Tasks Timing Commands To change timing parameters, use the following commands as appropriate, in voice-port configuration mode: Command Purpose Step 1 Router(config-voiceport)# timing dial-pulse min-delay Specifies time, in milliseconds, between the milliseconds generation of wink-like pulses when the type is pulse. Valid entries are from 0 to 5000. The default is 300 for the Cisco 3600 series routers. Router(config-
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Cisco High-Density Analog Voice and Fax Network Module Configuration Tasks Voice Quality Tuning Commands The commands in this section configure parameters to improve voice quality. Common voice quality issues include the following: � Configuring Adaptive Jitter Adjustment (optional) � Configuring Echo Adjustment (optional) � Configuring Voice Level Adjustment (optional) Configuring Adaptive Jitter Adjustment To configure the playout delay jitter buffer, use the following commands beginnin
