Phone Does Not Recognize Dtmf Digits Or Digits Are Delayed - Cisco 8800 Series Administration Manual

Solution
1 Verify the following:
a The Ethernet cable is attached.
b The Cisco CallManager service is running on the Cisco Unified Communications Manager server.
c Both phones are registered to the same Cisco Unified Communications Manager.
2 Audio server debug and capture logs are enabled for both phones. If needed, enable Java debug.

Phone Does Not Recognize DTMF Digits or Digits Are Delayed

Problem
The user complains that numbers are missed or delayed when the keypad is used.
Cause
Pressing the keys too quickly can result in missed or delayed digits.
Solution
Keys should not be pressed rapidly.
Troubleshooting Procedures
These procedures can be used to identify and correct problems.
Check TFTP Settings
Procedure
Step 1 On the Cisco IP Phone, press Applications, choose Admin settings > Network setup > Ethernet setup >
IPv4 setup > TFTP Server 1.
Step 2
If you have assigned a static IP address to the phone, you must manually enter a setting for the TFTP Server
1 option.
Step 3 If you are using DHCP, the phone obtains the address for the TFTP server from the DHCP server. Check that
the IP address is configured in Option 150.
Step 4 You can also enable the phone to use an alternate TFTP server. Such a setting is particularly useful if the
phone recently moved from one location to another.
Step 5
If the local DHCP does not offer the correct TFTP address, enable the phone to use an alternate TFTP server.
This is often necessary in VPN scenario.
Cisco IP Phone 8800 Series Administration Guide for Cisco Unified Communications Manager
Troubleshooting Procedures
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