Cisco Systems MC-607 manual Sgcp Protocol Stack, Metric Value, MC-621

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Configuring Subscriber-End Broadband Access Router Features

Voice over IP Operations

SGCP Protocol Stack

The Cisco uBR924 cable access router supports SGCP, an out-of-band signalling protocol that interacts with an external call agent to provide call setup and teardown for VoIP calls made through the Internet or a local intranet. Using the call control agent, SGCP communicates with the voice gateways, allowing you to create a distributed system that enhances performance, reliability, and scalability while still appearing as a single VoIP gateway to external clients. SGCP eliminates the need for a dial plan mapper and static configuration on the router to map IP addresses to telephone numbers because this function is provided by the external call agent.

In architectures using the SGCP protocol stack, the session application implements the gateway functionality defined to support both trunk and residential gateways. The Cisco uBR924 functions in this mode as a residential gateway with two endpoints.

SGCP can preserve signalling System 7 (SS7) style call control information and additional network information such as routing information and authentication, authorization, and accounting (AAA) security information. SGCP allows voice calls to originate and terminate on the Internet; it also allows one end to terminate on the Internet and the other to terminate on a telephone or PBX on the PSTN.

Note The Cisco uBR924 cable access router supports both H.323 and SGCP call control, but only one method can be active at a time.

Subscriber-End Broadband Access Router Voice Specifications

Table 39 Cisco uBR924 Cable Access Router Voice Specifications

Metric

Value

 

 

Loss (between DCS and BTI gateway)

Nominal: 4 dB ±0.5 dB (off hook)

 

Nominal: 9 dB ±0.5 dB (on hook)

 

 

Attenuation distortion:

Nominal:

DCS <> BTI (200 Hz to 3.5 kHz)

+1 dB/–3 dB

BTI<> DCS (304 Hz to 3004 Hz)

±0.5 dB

DCS -> BTI (204 Hz to 3004 Hz)

±0.5 dB0

 

 

Idle channel noise

<= 18 dBmC (noise shall not exceed)

 

 

Signal to C-notched noise

>= 35 dB

 

 

Intermodulation distortion:

 

R2

>= 52 dB

R3

>= 52 dB

 

 

Single frequency interference:

 

0 to 12 kHz

<= –28 dBmO

0 to 4 kHz

<= –40 dBmO

 

 

Frequency shift (offset)

<= ±0.2 Hz (max)

 

<= ±0.1 Hz (99.5%)

 

 

Cisco IOS Multiservice Applications Configuration Guide

MC-621

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Contents MC-607 Configuring Subscriber-End Broadband Access Router FeaturesCisco IOS Software Feature Sets Subscriber-end OverviewMC-608 Base IP Bridging Feature Set Home Office Easy IP Feature SetMC-609 Small Office Feature Set Telecommuter Feature SetMC-610 MC-611 Operating ModesData Specifications Description Downstream Values Upstream ValuesMC-612 MC-613 Service AssignmentsDownstream and Upstream Data Transfer Bridging ApplicationsMC-614 MC-615 Routing ApplicationsNetwork Address Translation and Port Address Translation L2TP ProtocolEasy IP Dhcp ServerMC-617 Voice over IP OperationsSimplified VoIP over Cable Network MC-618MC-619 Voice Compression and DecompressionMC-620 Protocol StackMC-621 Subscriber-End Broadband Access Router Voice SpecificationsSgcp Protocol Stack Metric ValueMC-622 Backup Pots ConnectionDocsis Baseline Privacy IPSec Network SecurityMC-623 MC-624 Triple Data Encryption StandardFirewall NetRanger Support-Cisco IOS Intrusion DetectionMC-625 Subscriber-End Broadband Access Router Configuration OptionsMC-626 MC-627 Event DescriptionMC-628 Sequence Event DescriptionMC-629 MC-630 MC-631 Cable Modem Initialization FlowchartMC-632 Subscriber-End Broadband Access Router Basic TroubleshootingWaitforlinkupstate MC-633UBR924# show controllers cable-modem 0 mac ? MC-634Event 1-Wait for the Link to Come Up Event 2-Scan for a Downstream Channel, then SynchronizeMC-635 Event 4-Start Ranging for Power Adjustments Event 3-Obtain Upstream ParametersMC-636 MC-637 Event 5-Establish IP ConnectivityEvent 9-Perform Registration Event 6-Establish the Time of DayEvent 7-Establish Security Event 8-Transfer Operational ParametersEvent 11-Enter the Maintenance State Event 10-Comply with Baseline PrivacyMC-639 MC-640 Subscriber-End Broadband Access Router Configuration TasksConfiguring a Host Name and Password Command PurposeMC-641 MC-642 Configuring Ethernet and Cable Access Router InterfacesMC-643 Configuring RoutingMC-644 Verifying RoutingMC-645 Configuring BridgingMC-646 MC-647 Reestablishing DOCSIS-Compliant BridgingMC-648 Verifying DOCSIS-Compliant BridgingCustomizing the Cable Access Router Interface Using Multiple PCs with the Cable Access RouterMC-649 MC-650 Basic Internet Access Bridging Configuration ExampleMC-651 Basic Internet Access Routing Configuration ExampleMC-652 IP Multicast Routing Configuration ExampleMC-653 VoIP Bridging Using H.323v2 Configuration ExampleMC-654 VoIP Routing Using H.323v2 Configuration ExampleMC-655 NAT/PAT Configuration ExampleMC-656 VoIP Bridging Using Sgcp Configuration ExampleMC-657 IPSec Configuration ExampleMC-658 L2TP Configuration ExampleMC-659 MC-660
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