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H.323
- Analog E&M Troubleshooting Guidelines (Cisco IOS Platforms) 02/Feb/2006
- Analog E&M Voice Signaling Overview 02/Feb/2006
- CDR Logging Configuration with Syslog Servers and Cisco IOS Gateways 24/Feb/2006
- CUCM Call Distribution Mechanism in SIP/H323 Trunk 05/Jun/2018
- Call Failure to Long Distance/Mobile Destination 03/Feb/2006
- Cisco CallManager and H.323 Gateway Interaction Issues 21/Aug/2006
- Cisco IOS, Phone, UCM and CUC Packet, and PCM Captures Command Reference 24/Jul/2014
- Cisco IOS, Phone, UCM and CUC Packet, and PCM Captures Command Reference 08/Jun/2017
- Defining Analog Voice 12/Feb/2007
- Designing and Deploying VoIP over ISDN 02/Feb/2006
- Direct, Routed, and Proxy Modes on a Gatekeeper Explanation 31/Mar/2015
- E&M Cable Pinouts Connecting Cisco 1750/2600/3600 E&M VIC to Lucent PBX G3R E&M Trunk 02/Feb/2006
- E&M Cable Pinouts to Connect Cisco 1750/2600/3600 E&M VIC to Nortel PBX Option 11 E&M Trunk 02/Feb/2006
- Fax Troubleshoot Guide - H.323 05/Feb/2015
- Frame Relay Traffic Shaping for VoIP and VoFR 02/Feb/2006
- H.323 T.38 Fax Relay Issues 22/Aug/2007
- Identify, Supersede, and Maintain Compatible DSP Firmware Version Levels on C5510 DSPs 23/Feb/2009
- Identify, Supersede, and Maintain Compatible DSP Firmware Version Levels on C5510 DSPs (PDF - 79 KB) 30/May/2014
- Implementing QoS Solutions for H.323 Video Conferencing over IP 15/Feb/2008
- PSTN Callers not Hearing any Ring Back When they Call IP Phones 03/Feb/2006
- Third Party H323 Calls Fail with Cisco IOS Later than 12.2(8)T 02/Feb/2006
- Toll-Fraud Prevention Feature in IOS Release 15.1(2)T 29/Jul/2010
- Troubleshoot Music On Hold Failure When Gateway is Integrated Service Router 4431 04/Jan/2018
- Troubleshooting DSPs on the PA-VXA/PA-VXB/PA-VXC T1/E1 Voice Port Adaptors and the PA-MCX MIX-Enabled Multichannel T1/E1 Port Adaptors for Cisco 7200/7400/7500 Series Routers 02/Feb/2006
- Troubleshooting GUP, Alternate Endpoint and Load Balancing 02/Feb/2006
- Troubleshooting Gatekeeper Endpoint Call Admission Issues 02/Feb/2006
- Troubleshooting Gatekeeper Registration Issues 01/Feb/2006
- Troubleshooting ISDN Call Failures Originated from NetMeeting or Similar 3rd Party H.323 Devices 02/Feb/2006
- Troubleshooting No Busy Tone and No Announcement Messages on ISDN-VoIP (H.323) Calls 22/Aug/2006
- Troubleshooting No Dial Tone Issues 02/Feb/2006
- Troubleshooting No Ringback Tone on ISDN-VoIP (H.323) Calls 27/Nov/2005
- Troubleshooting One Way Voice Issues 13/Oct/2008
- Troubleshooting Unrecognized Voice Interface Cards on Cisco 1750, 1751, and 1760 Routers 02/Feb/2006
- Troubleshooting Voice Connection Trunks 02/Feb/2006
- Troubleshooting and Debugging VoIP Call Basics 11/Oct/2005
- Understanding Cisco IOS Gatekeeper Call Routing 04/Jan/2007
- Understanding Codecs: Complexity, Hardware Support, MOS, and Negotiation 02/Feb/2006
- Understanding Direct-Inward-Dial (DID) on IOS Voice Digital (T1/E1) Interfaces 02/Feb/2006
- Understanding H.323 Gatekeepers 25/Sep/2014
- Understanding Inbound and Outbound Dial Peers on Cisco IOS Platforms 02/Feb/2006
- Understanding and Troubleshooting Gatekeeper TTL and Aging out Process 02/Feb/2006
- Understanding, Configuring and Troubleshooting Resource Allocation Indication 01/Feb/2006
- Voice Design and Implementation Guide 02/Feb/2006
- Waveform Coding Techniques 02/Feb/2006
- Zone Prefix Processing with Dots Versus Asterisks 22/May/2006
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Media Gateway Control Protocol (MGCP)
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Skinny Call Control Protocol (SCCP)
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Voice over ATM (VoATM)
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Voice over Frame Relay (VOFR)