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Voice
Gateway Protocols
Troubleshooting TechNotes
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H.323
Media Gateway Control Protocol (MGCP)
Skinny Call Control Protocol (SCCP)
Voice over ATM (VoATM)
Voice over Frame Relay (VOFR)
H.323
Analog E&M Troubleshooting Guidelines (Cisco IOS Platforms)
02/Feb/2006
Analog E&M Voice Signaling Overview
02/Feb/2006
Audio Codec Configuration on H.323 Signaling Interface (HSI)
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
08/Jun/2017
Cisco IOS, Phone, UCM and CUC Packet, and PCM Captures Command Reference
24/Jul/2014
Defining Analog Voice
12/Feb/2007
Designing and Deploying VoIP over ISDN
02/Feb/2006
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
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 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
Voice Design and Implementation Guide
02/Feb/2006
Waveform Coding Techniques
02/Feb/2006
Media Gateway Control Protocol (MGCP)
Cisco IOS, Phone, UCM and CUC Packet, and PCM Captures Command Reference
08/Jun/2017
Cisco IOS, Phone, UCM and CUC Packet, and PCM Captures Command Reference
24/Jul/2014
Configure Q.SIG PRI Trunks between Call Manager and Avaya S8700/G650 with Unity Voice Mail Integration
20/Aug/2006
Configure and Troubleshoot MGCP Gateways
28/Jul/2020
E&M Cable Pinouts Connecting Cisco 1750/2600/3600 E&M VIC to Lucent PBX G3R E&M Trunk
02/Feb/2006
FAX-MGCP Troubleshoot Guide
30/Jan/2015
PGW 2200 Softswitch Error Resolution for MGCP Hung Calls
02/Feb/2006
Understanding Codecs: Complexity, Hardware Support, MOS, and Negotiation
02/Feb/2006
Understanding MGCP Interactions with Cisco CallManager
18/May/2006
Voice Log Translator (VLT) Usage to Read and Interpret CUCM Traces
03/Mar/2015
WS-X6608-T1/E1 Digital Gateway Card on the Catalyst 6000 Platform Problem Resolution
02/Feb/2006
Skinny Call Control Protocol (SCCP)
Call Failure to Long Distance/Mobile Destination
03/Feb/2006
Fax Troubleshoot Guide
15/Jan/2015
IP Phone Replies to One Ping Out of Two
27/Jun/2011
Understanding Codecs: Complexity, Hardware Support, MOS, and Negotiation
02/Feb/2006
WS-X6608-T1/E1 Digital Gateway Card on the Catalyst 6000 Platform Problem Resolution
02/Feb/2006
Voice over ATM (VoATM)
Troubleshooting Unrecognized Voice Interface Cards on Cisco 1750, 1751, and 1760 Routers
02/Feb/2006
Troubleshooting Voice Connection Trunks
02/Feb/2006
Voice over Frame Relay (VOFR)
Designing and Deploying Multilink PPP over Frame Relay and ATM
16/Aug/2007
Frame Relay Fragmentation for Voice
20/Feb/2007
Frame Relay Traffic Shaping for VoIP and VoFR
02/Feb/2006
Troubleshooting Unrecognized Voice Interface Cards on Cisco 1750, 1751, and 1760 Routers
02/Feb/2006
Troubleshooting Voice Connection Trunks
02/Feb/2006
Waveform Coding Techniques
02/Feb/2006
Configuring SRS Telephony and MGCP Fallback
12/Feb/2008
MGCP and H.323 Voice Gateway Protocol Comparison
04/Aug/2006
VoIP over PPP Links with Quality of Service (LLQ / IP RTP Priority, LFI, cRTP)
01/Feb/2006
Support Documentation
All Support Documentation for this Series