Design Tools & References:
Traffic Analysis for Voice over IP (Erlang Models Explained)
UK Numbering Plan - The National Numbering Scheme - By Ofcom
Cisco Unified Communications Manager Express
Cisco Unified Survivable Remote Site Telephony
Codecs:
G.722-64 and iLBC Codec Support on Cisco Unified Border Elements, DSP Farms, and Voice Gateways
Commands:
Discussion on network-clock-participate
isdn overlap-receiving (problems)
Understanding Inbound and Outbound Dial Peers Matching on IOS Platforms
T1 CAS Signaling:
Understanding How Digital T1 CAS (Robbed Bit Signaling) Works in IOS Gateways
Configuring and Troubleshooting T1 CAS Signaling
Configuring MGCP CAS MD Package
T1 NFAS
Configuring NFAS with Four T1s
E1 R2 Signaling:
E1 R2 Signaling Configuration and Troubleshooting
Number Translations:
Number Translation using Voice Translation Profiles
NM-HDA
Understanding High-Density Analog Voice/Fax Network Modules (NM-HDA)
IP Communications High Density Analog Voice\Fax Network Modules
CMM
Cisco Catalyst 6500 and Cisco 7600 Series Communication Media Module Features
Communication Media Module IP Connectivity
EVM-HD
Cisco High Density Analog and Digital Extension Module for Voice and Fax
H323
Cisco IOS H.323 Gateway Configuration for Use with Cisco CallManager
Cisco IOS H.323 Configuration Guide
Troubleshooting No Ringback Tone on ISDN-VoIP (H.323) Calls
Troubleshooting No Busy Tone and No Announcement Messages H323 Calls
MGCP
MGCP VoIP Call Admission Control
Configuring MGCP-Controlled Backhaul of BRI Signaling in with Unified CallManager
Configuring Tone Download to MGCP Gateways
Configuring MGCP PRI Backhaul and T1 CAS Support for Cisco Unified CallManager
Busy-Out ISDN B-Channels in Cisco CallManager Configuration Example
SIP
SIP: Measurement-Based Call Admission Control for SIP
DNS SRV Records - SIP e-mail resolution 1
DNS SRV Records - SIP e-mail resolution 2
ISDN
Troubleshooting ISDN BRI Layer 3 Using the debug isdn q931 Command
Understanding debug isdn q931 Disconnect Cause Codes
E1 Troubleshooting Flowchart with details
E1 Error Event Troubleshooting Flowchart
DSP Farms
CallManager and IOS Gateway DSP Farm Configuration Example
High-Density Packet Voice Digital Signal Processor Modules (Details & pictures)
Cisco Enhanced Conferencing and Transcoding for Voice Gateway Routers
Understanding Codecs: Complexity, Hardware Support, MOS, and Negotiation
IP-IP Gateway / CUBE
Fundamental Cisco Multiservice IP-to-IP Gateway Configuration
Cisco Multiservice IP-to-IP Gateway with Gatekeeper
Gatekeeper
Understanding H.323 Gatekeepers
Understanding Cisco IOS Gatekeeper Call Routing
Troubleshooting Gatekeeper Registration Issues
Troubleshooting GUP, Alternate Endpoint and Load Balancing
Cisco High-Performance Gatekeeper
Cisco Multiservice IP-to-IP Gateway
Cisco Multiservice IP-to-IP Gateway with Gatekeeper
Analog Interfaces
Understanding E&M Voice Interface Cards
Understanding Foreign Exchange Station (FXS) Voice Interface Cards
Understanding FXO Disconnect Problem (VIC-2DID)
Analog Signaling (E & M, DID, FXS, FXO)
Inability To Break Dialtone in a Voice over IP Network
Q.SIG
Siemens QSIG Interoperability: Calling Name and Call Forward Do Not Work
Interoperability
Cisco CallManager and Cisco IOS Interoperability Guide
Cisco Voice Gateway Router Interoperability with CallManager
Faxing
T.37 = Unity IP Fax Outbound Gateway Configuration Example
T.37 = Unity IP Fax Inbound Gateway Configuration Example
Configuring T.37 Store and Forward Fax
Cisco Fax Services over IP Application Guide
Modems
SAA
Cisco Unified Operations Manager
Cisco Unified Operations Manager Home
Reference Guides:
Cisco IOS Voice Troubleshooting and Monitoring Guide
Cisco IOS Voice Command Reference
Digital Voice-Port Configuration Verification
Card type t1 0 / Card type e1 0
isdn layer1-emulate user | network
