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Troubleshooting No Dial Tone Issues
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This document discusses how to troubleshoot a voice network when no dial tone is heard from a voice port that is in the off-hook condition.
www.cisco.com/en/US/tech/tk1077/technologies_tech_note09186a00800a4795.shtml
03 Feb 2006
This document describes one reason why the analog phones attached to the VG224 Voice Gateway, which registers to Cisco CallManager as the Skinny Client Control Protocol (SCCP) gateway, receive no dial tone from the VG224 Voice Gateway when they are off-hook and provides a solution.
www.cisco.com/en/US/products/sw/voicesw/ps556/products_tech_note09186a00805552e9.shtml
03 Feb 2006
The Cisco 7900 series IP Phone users does not get the dial tone from the Callmanager and receive High Traffic Try Again Later error messages when they go off-hook. This document discusses how to troubleshoot this issue.
www.cisco.com/en/US/products/hw/phones/ps379/products_tech_note09186a008091c1dc.shtml
23 Jun 2008
This document addresses call progress in-band related issues when interworking ISDN and H.323 signaling between VoIP and Public Switched Telephone Network (PSTN) networks. Challenges arise when Cisco VoIP router/gateways exchange signaling capabilities with the Telco switch.
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www.cisco.com/en/US/tech/tk1077/technologies_tech_note09186a0080094c33.shtml
27 Nov 2005
This document addresses call progress in-band related issues when interworking ISDN and H.323 signaling between VoIP and the Public Switched Telephone Network (PSTN). Challenges arise when Cisco VoIP routers/gateways exchange signaling capabilties with the telco switch. This list describes common...
www.cisco.com/en/US/tech/tk652/tk653/technologies_tech_note09186a0080111b58.shtml
22 Aug 2006
This document demonstrates basic techniques and commands to troubleshoot and debug VoIP networks. An overview of the Voice Call Flow and Telephony Architecture in a Cisco Router is presented, followed by a step-by-step VoIP troubleshooting approach presented in these steps:
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www.cisco.com/en/US/tech/tk1077/technologies_tech_note09186a0080094045.shtml
11 Oct 2005
This document discusses analog recEive and transMit (E&M) Start Dial Supervision signaling. Start Dial Supervision is the line protocol that defines how the equipment seizes the E&M trunk and passes the address signaling information (sends dual tone multifrequency (DTMF) digits)....
www.cisco.com/en/US/tech/tk652/tk653/technologies_tech_note09186a0080093f61.shtml
02 Feb 2006
...router. Be sure that your dial plan concepts, basic call routing...configured before trying to troubleshoot a potential dial plan issue. Often, the problem lies...is getting a secondary dial tone. Also keep track of what they...Manager. 12. If a gateway has no access to Cisco Unified Communications...
www.cisco.com/en/US/docs/voice_ip_comm/cucm/trouble/6_0_1/tbdialrt.html
02 Jul 2007
A dial plan essentially describes the number and pattern of digits that a user dials to reach a particular telephone number. Access codes, area codes, specialized codes, and combinations of the number of digits dialed are all part of a dial plan. For instance, the North American...
www.cisco.com/en/US/products/sw/voicesw/ps556/products_tech_note09186a00800949f0.shtml
18 Jul 2006
...router. Be sure that your dial plan concepts, basic call routing...configured before trying to troubleshoot a potential dial plan issue. Often, the problem lies...is getting a secondary dial tone. Also keep track of what they...Manager. 12. If a gateway has no access to Cisco Unified Communications...
www.cisco.com/en/US/docs/voice_ip_comm/cucm/trouble/8_6_1/tbdialrt.html
22 Feb 2010
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