If there is an alarm light on the network module, then remove the module, put it back in the slot, and cycle the power.
The Cisco 1750 router should carry the proper PVDM-4 and PVDM-8 DSP cards.įor Cisco 1750, 2600, 3600, and MC3810 routers, a bad network module could be another problem. Also, no DSPs are seen in the show voice dsp command output. If the Cisco 1750 router does not have the correct PVDM, the voice ports may appear in show version and show diag command output however, there is no dial tone. These are packet voice/data modules (PVDMs) for Cisco routers 1751 and later. For a Cisco 1750 router, ensure that it does not have PVDM-256K-4 and PVDM-256K-8 DSPs.
When a router does not recognize a voice port, it may be because the router is not loaded with the proper Cisco IOS image required for voice support. If you have two FXS ports, test both of them. Note: Narrow the problem to either VIC-2FXS or NM-2V. If Steps 1 through 3 do not work, then replace the voice interface card (VIC). Use this procedure if there is no LED when your phone is off hook:Ĭheck the cable to ensure that it is RJ-11 with two pins for the FXS port.Ĭheck Cisco IOS to ensure that the feature set is either IP Plus or Enterprise Plus. The scenarios in this section describe the various problems and solutions related to no dial tone issues from a voice port. A faulty network module or Foreign Exchange Station (FXS) card may cause silence or no dial tone in a voice port. A voice port that is configured with connection trunk does not provide dial tone. This could be related to configuration issues, a hardware problem, a Digital Signal Processor (DSP) problem, or a bug in Cisco IOS® software. ProblemĪ common problem in the voice network is when no dial tone is heard from a voice port in the off-hook condition. Conventionsįor more information on document conventions, refer to the Cisco Technical Tips Conventions. If your network is live, make sure that you understand the potential impact of any command. All of the devices used in this document started with a cleared (default) configuration. The information in this document was created from the devices in a specific lab environment.
This document is not restricted to specific software or hardware versions. There are no specific requirements for this document. 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.
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