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Voice over IP on Cisco 1750 Routers
Voice over IP on Cisco 1750 Routers
This document describes the Voice-over-IP (VoIP) feature on Cisco 1750 routers.
The following sections are included:
Feature Overview
The Cisco 1750 router is a voice-and-data capable router that provides VoIP functionality and can carry voice traffic (for example, telephone calls and faxes) over an Internet Protocol (IP) network. Cisco voice support is implemented using voice packet technology.
In VoIP, the digital signal processor (DSP) segments the voice signal into frames and stores them in voice packets. These voice packets are transported by using IP in compliance with the International Telecommunications Union-Telecommunications (ITU-T) specification H.323, the specification for transmitting multimedia (voice, video, and data) across a network.
Because VoIP is a delay-sensitive application, you need to have a well-engineered, end-to-end network to use it successfully. Fine-tuning your network to adequately support VoIP involves using a series of protocols and features to improve quality of service (QoS). Traffic shaping considerations must also be considered to ensure the reliability of the voice connection.
To use the VoIP feature, you must have voice interface cards (VICs) installed in the Cisco 1750 router. For information about installing a VIC in the router, see the Cisco WAN Interface Cards Hardware Installation Guide.
Benefits
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Toll bypass: cost savings on intracompany voice calls, faxes, voice-mail storage and retrieval over the company intranet or the global Internet
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Restrictions
The command session target loopback:rtp is disabled because it causes an unexpected router reload on a Cisco 1750 router. This command loops all voice data back to the originating source using Real-Time Transport Protocol [RTP] for VoIP dial peers. This error is documented as caveat number CSCdm62047.
Note
Supported Platforms
The VoIP feature is supported on the Cisco 1750 router.
Configuration Tasks
Complete VoIP configuration instructions are described in the Cisco 1750 Router Voice over IP Configuration Guide and the Voice-over-IP Quick Start Guide. These documents are available on CCO and the Documentation CD-ROM as follows:
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Service & Support: Documentation Home Page: Access Servers and Access Routers: Modular Access Routers: Cisco 1750 Router
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Cisco Product Documentation: Access Servers and Access Routers: Modular Access Routers: Cisco 1750 Router
In Cisco IOS Release 12.0(1)T or later, you can search and filter the output for show and more commands. This functionality is useful when you need to sort through large amounts of output, or if you want to exclude output that you do not need to see.
To use this functionality, enter a show or more command followed by the "pipe" character (|), one of the keywords begin, include, or exclude, and an expression that you want to search or filter on:
command | {begin | include | exclude} regular-expression
Following is an example of the show atm vc command in which you want the command output to begin with the first line where the expression "PeakRate" appears:
show atm vc | begin PeakRate
For more information on the search and filter functionality, refer to the Cisco IOS Release 12.0(1)T feature module titled CLI String Search.
Configuration Examples
See the "Examples" headings in the section "Command Reference" for samples of the commands show controllers voice, show diag, and show voice dsp.
Command Reference
This section documents new and modified commands that configure the VoIP feature. All other commands used with this feature are documented in the Cisco 1750 Router Voice over IP Configuration Guide and the Cisco IOS Release 12.0 Command Reference publications.
show controllers voice
To display information about voice related hardware, use the show controllers voice privileged EXEC command.
show controllers voice
Syntax Description
This command contains no arguments or keywords.
Command Mode
Privileged EXEC.
Command History
Cisco IOS Release 12.0(5)XQ
The command show voice dsp was introduced on the Cisco 1750 router.
Usage Guidelines
This command displays interface status information that is specific to voice-related hardware, such as, the registers of the TDM switch, the host port interface of the DSP, and the DSP firmware versions. The information displayed is generally only useful for diagnostic tasks performed by technical support.
Examples
The following is an example of the output from the show controllers voice command:
router# show controllers voiceEPIC Switch registers:STDA 0xFF STDB 0xFF SARA 0xAD SARB 0xFF SAXA 0xFF SAXB 0x0 STCR 0x3FMFAIR 0x3FSTAR 0x65 OMDR 0xE2 VNSR 0x0 PMOD 0x4C PBNR 0xFF POFD 0xF0 POFU 0x18PCSR 0x1 PICM 0x0 CMD1 0xA0 CMD2 0x70 CBNR 0xFF CTAR 0x2 CBSR 0x20 CSCR0x0DSP 0 Host Port Interface:HPI Control Register 0x202InterfaceStatus 0x2A MaxMessageSize 0x80RxRingBufferSize 0x6 TxRingBufferSize 0x9pInsertRx 0x4 pRemoveRx 0x4 pInsertTx 0x6 pRemoveTx 0x6Rx Message 0:packet_length 100 channel_id 2 packet_id 0 process id 0x10000: 0000 4AC7 5F08 91D1 0000 0000 7DF1 69E5 63E1 63E20020: 6E7C ED67 DE5D DB5C DC60 EC7E 6BE1 58D3 50CD 4DCE0040: 50D2 5AE5 7868 DA52 CE4A C746 C647 C94B D25A EAF40060: 5DD7 4FCD 4ACA 4ACC 4FD3 5DE8 F769 DC58 D352 D2530080: D65B E573 6CDF 59D3 4ECF 4FD0Rx Message 1:packet_length 100 channel_id 1 packet_id 0 process id 0x10000: 0000 1CDD 3E48 3B74 0000 0000 3437 3D4C F0C8 BBB50020: B2B3 B7BF D25B 4138 3331 3339 435F CFBD B6B2 B1B40040: BBC8 7E48 3B34 3131 363D 4FDE C3B9 B3B1 B3B8 C2DB0060: 533F 3833 3235 3B48 71CC BDB7 B4B5 B8BF CF67 483D0080: 3836 383C 455B DAC6 BDB9 B9BBRx Message 2:packet_length 100 channel_id 2 packet_id 0 process id 0x10000: 0000 4AC8 5F08 9221 0000 0000 54DA 61F5 EF60 DA530020: CF4F CD4E D256 DB63 FCEE 5FDA 55D1 50CF 4FD3 56D80040: 5DE1 6E7C EC60 DC59 D655 D456 D85D DF6A F4F4 69E20060: 5CDD 5BDC 5BDE 61E9 6DF1 FF76 F16D E96A E566 EA6A0080: EB6F F16D EF79 F776 F5F5 73F0Rx Message 3:packet_length 100 channel_id 1 packet_id 0 process id 0x10000: 0000 1CDE 3E48 3BC4 0000 0000 C0CC EC54 453E 3C3C0020: 3F47 56F3 D1C7 C1BF C0C6 CEE1 6752 4A46 4648 4E590040: 6FE4 D6CF CDCE D2DA E57E 675E 5B5B 5E62 6B76 FCF60060: F6FA 7D75 7373 7BF5 EAE1 DCDA DADD E6FE 6559 514D0080: 4D4E 5563 EFD9 CDC8 C5C6 CAD1Rx Message 4:packet_length 100 channel_id 2 packet_id 0 process id 0x10000: 0000 4AC6 5F08 9181 0000 0000 DD5B DC5E E161 E4680020: FAFD 6CE1 5AD3 53D1 53D7 61EC EA59 CF4A C644 C3440040: CA4E D86C 60D0 48C2 3EBD 3CBD 3EC0 47CF 5976 DF4F0060: C945 C242 C146 C94E D668 73DB 54CE 4DCC 4DCE 53DB0080: 64F9 ED63 DC59 DA58 DC5D E46CRx Message 5:packet_length 100 channel_id 1 packet_id 0 process id 0x10000: 0000 1CDC 3E48 3B24 0000 0000 5B5B 5D62 6A76 FCF50020: F5F9 7D78 7374 7CF5 EAE1 DDDA DBDD E7FE 6559 514E0040: 4D4F 5663 EFD8 CDC8 C6C6 CAD1 E760 4E46 403F 40470060: 5173 D5C7 BFBC BCBE C5D4 6D4C 3F3B 3939 3D46 5ADB0080: C5BC B7B6 B8BD C8E8 4F3F 3835Tx Message 0:packet_length 100 channel_id 1 packet_id 0 process id 0x10000: 0000 4AC6 5F08 9181 0000 003C DD5B DC5E E161 E4680020: FAFD 6CE1 5AD3 53D1 53D7 61EC EA59 CF4A C644 C3440040: CA4E D86C 60D0 48C2 3EBD 3CBD 3EC0 47CF 5976 DF4F0060: C945 C242 C146 C94E D668 73DB 54CE 4DCC 4DCE 53DB0080: 64F9 ED63 DC59 DA58 DC5D E46CTx Message 1:packet_length 100 channel_id 2 packet_id 0 process id 0x10000: 0000 1CDC 3E48 3B24 0000 003C 5B5B 5D62 6A76 FCF50020: F5F9 7D78 7374 7CF5 EAE1 DDDA DBDD E7FE 6559 514E0040: 4D4F 5663 EFD8 CDC8 C6C6 CAD1 E760 4E46 403F 40470060: 5173 D5C7 BFBC BCBE C5D4 6D4C 3F3B 3939 3D46 5ADB0080: C5BC B7B6 B8BD C8E8 4F3F 3835Tx Message 2:packet_length 100 channel_id 1 packet_id 0 process id 0x10000: 0000 4AC7 5F08 91D1 0000 003C 7DF1 69E5 63E1 63E20020: 6E7C ED67 DE5D DB5C DC60 EC7E 6BE1 58D3 50CD 4DCE0040: 50D2 5AE5 7868 DA52 CE4A C746 C647 C94B D25A EAF40060: 5DD7 4FCD 4ACA 4ACC 4FD3 5DE8 F769 DC58 D352 D2530080: D65B E573 6CDF 59D3 4ECF 4FD0Tx Message 3:packet_length 100 channel_id 2 packet_id 0 process id 0x10000: 0000 1CDD 3E48 3B74 0000 003C 3437 3D4C F0C8 BBB50020: B2B3 B7BF D25B 4138 3331 3339 435F CFBD B6B2 B1B40040: BBC8 7E48 3B34 3131 363D 4FDE C3B9 B3B1 B3B8 C2DB0060: 533F 3833 3235 3B48 71CC BDB7 B4B5 B8BF CF67 483D0080: 3836 383C 455B DAC6 BDB9 B9BBTx Message 4:packet_length 100 channel_id 1 packet_id 0 process id 0x10000: 0000 4AC8 5F08 9221 0000 003C 54DA 61F5 EF60 DA530020: CF4F CD4E D256 DB63 FCEE 5FDA 55D1 50CF 4FD3 56D80040: 5DE1 6E7C EC60 DC59 D655 D456 D85D DF6A F4F4 69E20060: 5CDD 5BDC 5BDE 61E9 6DF1 FF76 F16D E96A E566 EA6A0080: EB6F F16D EF79 F776 F5F5 73F0Tx Message 5:packet_length 100 channel_id 2 packet_id 0 process id 0x10000: 0000 1CDE 3E48 3BC4 0000 003C C0CC EC54 453E 3C3C0020: 3F47 56F3 D1C7 C1BF C0C6 CEE1 6752 4A46 4648 4E590040: 6FE4 D6CF CDCE D2DA E57E 675E 5B5B 5E62 6B76 FCF60060: F6FA 7D75 7373 7BF5 EAE1 DCDA DADD E6FE 6559 514D0080: 4D4E 5563 EFD9 CDC8 C5C6 CAD1Tx Message 6:packet_length 100 channel_id 2 packet_id 0 process id 0x10000: 0000 1CDA 3E48 3A84 0000 003C E75F 4E46 403F 41470020: 5174 D5C7 BFBC BCBE C5D4 6C4C 3F3B 3939 3D46 5BDA0040: C5BC B7B6 B8BD C8E9 4F3F 3834 3437 3D4C EEC8 BBB50060: B2B3 B8BF D35A 4138 3331 3339 435F CEBD B6B1 B1B40080: BBC9 7C48 3B34 3131 363D 4FDETx Message 7:packet_length 100 channel_id 1 packet_id 0 process id 0x10000: 0000 4AC5 5F08 9131 0000 003C 66DE 66EB 67EE FE6E0020: F7E7 6B68 E068 EE6A DF5C DF62 EDF1 6FF2 7A78 67DC0040: 5EDF 62E7 64E6 66E0 7071 EA69 F86E E260 DE5D E6650060: EB75 F0FB 6DE9 64E4 69E3 66EA 67E9 6DF9 F177 EC6E0080: EB6E F876 F875 7D6E E966 E05DTx Message 8:packet_length 100 channel_id 2 packet_id 0 process id 0x10000: 0000 1CDB 3E48 3AD4 0000 003C C2B9 B3B1 B3B8 C2DC0020: 523F 3733 3235 3C49 72CB BDB7 B4B5 B8BF CF67 483C0040: 3836 373C 455C DAC6 BDB9 B9BB C0CC EE54 453E 3C3C0060: 3F47 56F1 D1C7 C1BF C0C6 CEE1 6651 4A46 4648 4D590080: 70E3 D6CF CDCE D2D9 E67E 675EBootloader 1.8, Appn 3.1Application firmware 3.1.8, Built by claux on Thu Jun 17 11:00:05 1999VIC Interface Foreign Exchange Station 0/0, DSP instance (0x19543C0)Singalling channel num 128 Signalling proxy 0x0 Signaling dsp 0x19543C0tx outstanding 0, max tx outstanding 32ptr 0x0, length 0x0, max length 0x0dsp_number 0, Channel ID 1received 0 packets, 0 bytes, 0 gaint packets0 drops, 0 no buffers, 0 input errors 0 input overruns650070 bytes output, 4976 frames output, 0 output errors, 0 outputunderrun0 unaligned framesVIC Interface Foreign Exchange Station 0/1, DSP instance (0x1954604)Singalling channel num 129 Signalling proxy 0x0 Signaling dsp 0x1954604tx outstanding 0, max tx outstanding 32ptr 0x0, length 0x0, max length 0x0dsp_number 0, Channel ID 2received 0 packets, 0 bytes, 0 gaint packets0 drops, 0 no buffers, 0 input errors 0 input overruns393976 bytes output, 3982 frames output, 0 output errors, 0 outputunderrun0 unaligned framesRelated Commands
show diag
To display hardware information for the router, use the show diag privileged EXEC command.
show diag
Syntax Description
This command contains no arguments or keywords.
Command Mode
Privileged EXEC.
Command History
Usage Guidelines
This command displays information for the electrically erasable programmable read-only memory (EEPROM), the motherboard, and the WAN interface cards and voice interface cards (WICs and VICs).
Examples
The following is sample output from the show diag command:
router# show diagSlot 0:C1750 1FE VE Mainboard port adapter, 6 portsPort adapter is analyzedPort adapter insertion time unknownEEPROM contents at hardware discovery:Hardware revision 0.0 Board revision UNKNOWNSerial number 1314672220 Part number 00-0000-00Test history 0x0 RMA number 00-00-00EEPROM format version 1EEPROM contents (hex):0x20:01 C9 00 00 4E 5C 4E 5C 00 00 00 00 00 00 00 000x30:00 00 00 04 00 00 00 00 00 00 00 00 00 00 00 00Packet Voice DSP Module:Hardware Revision :1.0Board Revision :01Processor type :02Part Number :73-3933-01Number of DSP's :2Type of DSP :TMS320C549EEPROM format version 4EEPROM contents (hex):0x00: 04 FF 40 01 5B 41 01 00 42 30 31 09 02 82 49 0F0x10: 5D 01 FFWIC Slot 0:BRI U - 2091 WAN daughter cardHardware revision 1.3 Board revision A0Serial number 0004147773 Part number 800-01834-01Test history 0x00 RMA number 00-00-00Connector type WAN ModuleEEPROM format version 1EEPROM contents (hex):0x20: 01 09 01 03 00 3F 4A 3D 50 07 2A 01 00 00 00 000x30: 50 00 00 00 96 11 06 01 FF FF FF FF FF FF FF FFWIC Slot 1:Dual FXS Voice Interface Card WAN daughter cardHardware revision 1.1 Board revision C0Serial number 0010377882 Part number 800-02493-01Test history 0x00 RMA number 00-00-00Connector type WAN ModuleEEPROM format version 1EEPROM contents (hex):0x20: 01 0E 01 01 00 9E 5A 9A 50 09 BD 01 00 00 00 000x30: 60 00 00 00 98 09 10 01 FF FF FF FF FF FF FF FFWIC Slot 2:Dual EAM Voice Interface Card WAN daughter cardHardware revision 1.1 Board revision C0Serial number 0009886880 Part number 800-02497-01Test history 0x00 RMA number 00-00-00Connector type WAN ModuleEEPROM format version 1EEPROM contents (hex):0x20: 01 0F 01 01 00 96 DC A0 50 09 C1 01 00 00 00 000x30: 60 00 00 00 98 08 26 01 FF FF FF FF FF FF FF FFRelated Commands
show voice dsp
To show the current status of all DSP voice channels, use the privileged EXEC
command show voice dsp.show voice dsp
Syntax Description
This command has no arguments or keywords.
Command Mode
Privileged EXEC.
Command History
Usage Guidelines
This command also applies to Voice over Frame Relay, Voice over ATM, and Voice over HDLC on the Cisco MC3810 router.
Examples
Following is an example of the output from the command show voice dsp for the Cisco 1750 router.
router# show voice dspDSP#0: state IN SERVICE, 2 channels allocatedchannel#0: voice port 1/0, codec G711 ulaw, state UPchannel#1: voice port 1/1, codec G711 ulaw, state UPDSP#1: state IN SERVICE, 2 channels allocatedchannel#0: voice port 2/0, codec G711 ulaw, state UPchannel#1: voice port 2/1, codec G711 ulaw, state UPDSP#2: state RESET, 0 channels allocatedexplains the fields in the example output.
Table 1 Show Voice DSP Command Field Descriptions
Related Commands
