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This document describes the Voice-over-IP (VoIP) feature on Cisco 1750 routers.
The following sections are included:
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.
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.
The VoIP feature is supported on the Cisco 1750 router.
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:
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.
See the "Examples" headings in the section "Command Reference" for samples of the commands show controllers voice, show diag, and show voice dsp.
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.
To display information about voice related hardware, use the show controllers voice privileged EXEC command.
show controllers voiceThis command contains no arguments or keywords.
Privileged EXEC.
| Release | Modification |
|---|---|
Cisco IOS Release 12.0(5)XQ | The command show voice dsp was introduced on the Cisco 1750 router. |
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.
The following is an example of the output from the show controllers voice command:
router# show controllers voice EPIC Switch registers: STDA 0xFF STDB 0xFF SARA 0xAD SARB 0xFF SAXA 0xFF SAXB 0x0 STCR 0x3F MFAIR 0x3F STAR 0x65 OMDR 0xE2 VNSR 0x0 PMOD 0x4C PBNR 0xFF POFD 0xF0 POFU 0x18 PCSR 0x1 PICM 0x0 CMD1 0xA0 CMD2 0x70 CBNR 0xFF CTAR 0x2 CBSR 0x20 CSCR 0x0 DSP 0 Host Port Interface: HPI Control Register 0x202 InterfaceStatus 0x2A MaxMessageSize 0x80 RxRingBufferSize 0x6 TxRingBufferSize 0x9 pInsertRx 0x4 pRemoveRx 0x4 pInsertTx 0x6 pRemoveTx 0x6 Rx Message 0: packet_length 100 channel_id 2 packet_id 0 process id 0x1 0000: 0000 4AC7 5F08 91D1 0000 0000 7DF1 69E5 63E1 63E2 0020: 6E7C ED67 DE5D DB5C DC60 EC7E 6BE1 58D3 50CD 4DCE 0040: 50D2 5AE5 7868 DA52 CE4A C746 C647 C94B D25A EAF4 0060: 5DD7 4FCD 4ACA 4ACC 4FD3 5DE8 F769 DC58 D352 D253 0080: D65B E573 6CDF 59D3 4ECF 4FD0 Rx Message 1: packet_length 100 channel_id 1 packet_id 0 process id 0x1 0000: 0000 1CDD 3E48 3B74 0000 0000 3437 3D4C F0C8 BBB5 0020: B2B3 B7BF D25B 4138 3331 3339 435F CFBD B6B2 B1B4 0040: BBC8 7E48 3B34 3131 363D 4FDE C3B9 B3B1 B3B8 C2DB 0060: 533F 3833 3235 3B48 71CC BDB7 B4B5 B8BF CF67 483D 0080: 3836 383C 455B DAC6 BDB9 B9BB Rx Message 2: packet_length 100 channel_id 2 packet_id 0 process id 0x1 0000: 0000 4AC8 5F08 9221 0000 0000 54DA 61F5 EF60 DA53 0020: CF4F CD4E D256 DB63 FCEE 5FDA 55D1 50CF 4FD3 56D8 0040: 5DE1 6E7C EC60 DC59 D655 D456 D85D DF6A F4F4 69E2 0060: 5CDD 5BDC 5BDE 61E9 6DF1 FF76 F16D E96A E566 EA6A 0080: EB6F F16D EF79 F776 F5F5 73F0 Rx Message 3: packet_length 100 channel_id 1 packet_id 0 process id 0x1 0000: 0000 1CDE 3E48 3BC4 0000 0000 C0CC EC54 453E 3C3C 0020: 3F47 56F3 D1C7 C1BF C0C6 CEE1 6752 4A46 4648 4E59 0040: 6FE4 D6CF CDCE D2DA E57E 675E 5B5B 5E62 6B76 FCF6 0060: F6FA 7D75 7373 7BF5 EAE1 DCDA DADD E6FE 6559 514D 0080: 4D4E 5563 EFD9 CDC8 C5C6 CAD1 Rx Message 4: packet_length 100 channel_id 2 packet_id 0 process id 0x1 0000: 0000 4AC6 5F08 9181 0000 0000 DD5B DC5E E161 E468 0020: FAFD 6CE1 5AD3 53D1 53D7 61EC EA59 CF4A C644 C344 0040: CA4E D86C 60D0 48C2 3EBD 3CBD 3EC0 47CF 5976 DF4F 0060: C945 C242 C146 C94E D668 73DB 54CE 4DCC 4DCE 53DB 0080: 64F9 ED63 DC59 DA58 DC5D E46C Rx Message 5: packet_length 100 channel_id 1 packet_id 0 process id 0x1 0000: 0000 1CDC 3E48 3B24 0000 0000 5B5B 5D62 6A76 FCF5 0020: F5F9 7D78 7374 7CF5 EAE1 DDDA DBDD E7FE 6559 514E 0040: 4D4F 5663 EFD8 CDC8 C6C6 CAD1 E760 4E46 403F 4047 0060: 5173 D5C7 BFBC BCBE C5D4 6D4C 3F3B 3939 3D46 5ADB 0080: C5BC B7B6 B8BD C8E8 4F3F 3835 Tx Message 0: packet_length 100 channel_id 1 packet_id 0 process id 0x1 0000: 0000 4AC6 5F08 9181 0000 003C DD5B DC5E E161 E468 0020: FAFD 6CE1 5AD3 53D1 53D7 61EC EA59 CF4A C644 C344 0040: CA4E D86C 60D0 48C2 3EBD 3CBD 3EC0 47CF 5976 DF4F 0060: C945 C242 C146 C94E D668 73DB 54CE 4DCC 4DCE 53DB 0080: 64F9 ED63 DC59 DA58 DC5D E46C Tx Message 1: packet_length 100 channel_id 2 packet_id 0 process id 0x1 0000: 0000 1CDC 3E48 3B24 0000 003C 5B5B 5D62 6A76 FCF5 0020: F5F9 7D78 7374 7CF5 EAE1 DDDA DBDD E7FE 6559 514E 0040: 4D4F 5663 EFD8 CDC8 C6C6 CAD1 E760 4E46 403F 4047 0060: 5173 D5C7 BFBC BCBE C5D4 6D4C 3F3B 3939 3D46 5ADB 0080: C5BC B7B6 B8BD C8E8 4F3F 3835 Tx Message 2: packet_length 100 channel_id 1 packet_id 0 process id 0x1 0000: 0000 4AC7 5F08 91D1 0000 003C 7DF1 69E5 63E1 63E2 0020: 6E7C ED67 DE5D DB5C DC60 EC7E 6BE1 58D3 50CD 4DCE 0040: 50D2 5AE5 7868 DA52 CE4A C746 C647 C94B D25A EAF4 0060: 5DD7 4FCD 4ACA 4ACC 4FD3 5DE8 F769 DC58 D352 D253 0080: D65B E573 6CDF 59D3 4ECF 4FD0 Tx Message 3: packet_length 100 channel_id 2 packet_id 0 process id 0x1 0000: 0000 1CDD 3E48 3B74 0000 003C 3437 3D4C F0C8 BBB5 0020: B2B3 B7BF D25B 4138 3331 3339 435F CFBD B6B2 B1B4 0040: BBC8 7E48 3B34 3131 363D 4FDE C3B9 B3B1 B3B8 C2DB 0060: 533F 3833 3235 3B48 71CC BDB7 B4B5 B8BF CF67 483D 0080: 3836 383C 455B DAC6 BDB9 B9BB Tx Message 4: packet_length 100 channel_id 1 packet_id 0 process id 0x1 0000: 0000 4AC8 5F08 9221 0000 003C 54DA 61F5 EF60 DA53 0020: CF4F CD4E D256 DB63 FCEE 5FDA 55D1 50CF 4FD3 56D8 0040: 5DE1 6E7C EC60 DC59 D655 D456 D85D DF6A F4F4 69E2 0060: 5CDD 5BDC 5BDE 61E9 6DF1 FF76 F16D E96A E566 EA6A 0080: EB6F F16D EF79 F776 F5F5 73F0 Tx Message 5: packet_length 100 channel_id 2 packet_id 0 process id 0x1 0000: 0000 1CDE 3E48 3BC4 0000 003C C0CC EC54 453E 3C3C 0020: 3F47 56F3 D1C7 C1BF C0C6 CEE1 6752 4A46 4648 4E59 0040: 6FE4 D6CF CDCE D2DA E57E 675E 5B5B 5E62 6B76 FCF6 0060: F6FA 7D75 7373 7BF5 EAE1 DCDA DADD E6FE 6559 514D 0080: 4D4E 5563 EFD9 CDC8 C5C6 CAD1 Tx Message 6: packet_length 100 channel_id 2 packet_id 0 process id 0x1 0000: 0000 1CDA 3E48 3A84 0000 003C E75F 4E46 403F 4147 0020: 5174 D5C7 BFBC BCBE C5D4 6C4C 3F3B 3939 3D46 5BDA 0040: C5BC B7B6 B8BD C8E9 4F3F 3834 3437 3D4C EEC8 BBB5 0060: B2B3 B8BF D35A 4138 3331 3339 435F CEBD B6B1 B1B4 0080: BBC9 7C48 3B34 3131 363D 4FDE Tx Message 7: packet_length 100 channel_id 1 packet_id 0 process id 0x1 0000: 0000 4AC5 5F08 9131 0000 003C 66DE 66EB 67EE FE6E 0020: F7E7 6B68 E068 EE6A DF5C DF62 EDF1 6FF2 7A78 67DC 0040: 5EDF 62E7 64E6 66E0 7071 EA69 F86E E260 DE5D E665 0060: EB75 F0FB 6DE9 64E4 69E3 66EA 67E9 6DF9 F177 EC6E 0080: EB6E F876 F875 7D6E E966 E05D Tx Message 8: packet_length 100 channel_id 2 packet_id 0 process id 0x1 0000: 0000 1CDB 3E48 3AD4 0000 003C C2B9 B3B1 B3B8 C2DC 0020: 523F 3733 3235 3C49 72CB BDB7 B4B5 B8BF CF67 483C 0040: 3836 373C 455C DAC6 BDB9 B9BB C0CC EE54 453E 3C3C 0060: 3F47 56F1 D1C7 C1BF C0C6 CEE1 6651 4A46 4648 4D59 0080: 70E3 D6CF CDCE D2D9 E67E 675E Bootloader 1.8, Appn 3.1 Application firmware 3.1.8, Built by claux on Thu Jun 17 11:00:05 1999 VIC Interface Foreign Exchange Station 0/0, DSP instance (0x19543C0) Singalling channel num 128 Signalling proxy 0x0 Signaling dsp 0x19543C0 tx outstanding 0, max tx outstanding 32 ptr 0x0, length 0x0, max length 0x0 dsp_number 0, Channel ID 1 received 0 packets, 0 bytes, 0 gaint packets 0 drops, 0 no buffers, 0 input errors 0 input overruns 650070 bytes output, 4976 frames output, 0 output errors, 0 output underrun 0 unaligned frames VIC Interface Foreign Exchange Station 0/1, DSP instance (0x1954604) Singalling channel num 129 Signalling proxy 0x0 Signaling dsp 0x1954604 tx outstanding 0, max tx outstanding 32 ptr 0x0, length 0x0, max length 0x0 dsp_number 0, Channel ID 2 received 0 packets, 0 bytes, 0 gaint packets 0 drops, 0 no buffers, 0 input errors 0 input overruns 393976 bytes output, 3982 frames output, 0 output errors, 0 output underrun 0 unaligned frames
| Command | Description |
show dial-peer voice | Display the configuration information for dial peers. |
Display hardware information for the router. | |
Display the current status of all DSP voice channels. | |
show voice call summary | Display the call status for all voice ports on the Cisco 1750 router. |
show voice port | Display configuration information about a specific voice port. |
To display hardware information for the router, use the show diag privileged EXEC command.
show diagThis command contains no arguments or keywords.
Privileged EXEC.
| Release | Modification |
|---|---|
Cisco IOS Release 11.1 CA | The command show diag first appeared in Cisco IOS Release 11.1 CA. |
Cisco IOS Release 11.2 P | The command show diag was modified to update the sample display for the port adapters PA-12E/2FE, PA-E3, and PA-T3. |
Cisco IOS Release 11.3 XA | The command show diag was made available for Cisco IOS Release 11.3 XA. |
Cisco IOS Release 12.0(5)XQ | The command show diag was enhanced and made available for the Cisco 1750 router. |
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).
The following is sample output from the show diag command:
router# show diag
Slot 0:
C1750 1FE VE Mainboard port adapter, 6 ports
Port adapter is analyzed
Port adapter insertion time unknown
EEPROM contents at hardware discovery:
Hardware revision 0.0 Board revision UNKNOWN
Serial number 1314672220 Part number 00-0000-00
Test history 0x0 RMA number 00-00-00
EEPROM format version 1
EEPROM contents (hex):
0x20:01 C9 00 00 4E 5C 4E 5C 00 00 00 00 00 00 00 00
0x30:00 00 00 04 00 00 00 00 00 00 00 00 00 00 00 00
Packet Voice DSP Module:
Hardware Revision :1.0
Board Revision :01
Processor type :02
Part Number :73-3933-01
Number of DSP's :2
Type of DSP :TMS320C549
EEPROM format version 4
EEPROM contents (hex):
0x00: 04 FF 40 01 5B 41 01 00 42 30 31 09 02 82 49 0F
0x10: 5D 01 FF
WIC Slot 0:
BRI U - 2091 WAN daughter card
Hardware revision 1.3 Board revision A0
Serial number 0004147773 Part number 800-01834-01
Test history 0x00 RMA number 00-00-00
Connector type WAN Module
EEPROM format version 1
EEPROM contents (hex):
0x20: 01 09 01 03 00 3F 4A 3D 50 07 2A 01 00 00 00 00
0x30: 50 00 00 00 96 11 06 01 FF FF FF FF FF FF FF FF
WIC Slot 1:
Dual FXS Voice Interface Card WAN daughter card
Hardware revision 1.1 Board revision C0
Serial number 0010377882 Part number 800-02493-01
Test history 0x00 RMA number 00-00-00
Connector type WAN Module
EEPROM format version 1
EEPROM contents (hex):
0x20: 01 0E 01 01 00 9E 5A 9A 50 09 BD 01 00 00 00 00
0x30: 60 00 00 00 98 09 10 01 FF FF FF FF FF FF FF FF
WIC Slot 2:
Dual EAM Voice Interface Card WAN daughter card
Hardware revision 1.1 Board revision C0
Serial number 0009886880 Part number 800-02497-01
Test history 0x00 RMA number 00-00-00
Connector type WAN Module
EEPROM format version 1
EEPROM contents (hex):
0x20: 01 0F 01 01 00 96 DC A0 50 09 C1 01 00 00 00 00
0x30: 60 00 00 00 98 08 26 01 FF FF FF FF FF FF FF FF
| Command | Description |
Display information about voice related hardware. | |
show dial-peer voice | Display the configuration information for dial peers. |
Display the current status of all DSP voice channels. | |
show voice call summary | Display the call status for all voice ports on the Cisco 1750 router. |
show voice port | Display configuration information about a specific voice port. |
To show the current status of all DSP voice channels, use the privileged EXEC
command show voice dsp.
This command has no arguments or keywords.
Privileged EXEC.
| Release | Modification |
|---|---|
Cisco IOS Release 11.3 MA | The command show voice dsp was introduced on the Cisco MC3810 router. |
Cisco IOS Release 12.0(5)XQ | The command show voice dsp was introduced on the Cisco 1750 router. |
This command also applies to Voice over Frame Relay, Voice over ATM, and Voice over HDLC on the Cisco MC3810 router.
Following is an example of the output from the command show voice dsp for the Cisco 1750 router.
router# show voice dsp DSP#0: state IN SERVICE, 2 channels allocated channel#0: voice port 1/0, codec G711 ulaw, state UP channel#1: voice port 1/1, codec G711 ulaw, state UP DSP#1: state IN SERVICE, 2 channels allocated channel#0: voice port 2/0, codec G711 ulaw, state UP channel#1: voice port 2/1, codec G711 ulaw, state UP DSP#2: state RESET, 0 channels allocated
Table 1 explains the fields in the example output.
| Field | Description |
|---|---|
DSP | Number of the DSP. |
Channel | Number of the channel and its status. |
| Command | Description |
Display information about voice related hardware. | |
show dial-peer voice | Display the configuration information for dial peers. |
Display hardware information for the router. | |
show voice call summary | Display the call status for all voice ports on the Cisco 1750 router. |
show voice port | Display configuration information about a specific voice port. |
Posted: Sun Dec 12 16:46:49 PST 1999
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