Is this a single phone that it is happening on? If so, you may have a hardware failure.
If there are multiple phones this is happening on your best bet is to open a TAC case unless you are well equiped for wireless sniffing/packet capture. You would need to see if there is any delay in the SCCP signaling packets/frames either on the wire or in the air.
SIP traces provide key information in troubleshooting SIP Trunks, SIP
endpoints and other SIP related issues. Even though these traces are in
clear text, these texts can be gibberish unless you understand fully
what they mean. This document attempts to br...
Please find the attached HTML document, download and open it on your PC.
This provides an easy to use form where you simply answer a few
questions and it will render the proper jabber-config.xml file for you
to copy/paste. There is built in logic to verif...
CUCM Database Replication is an area in which Cisco customers and
partners have asked for more in-depth training in being able to properly
assess a replication problem and potentially resolve an issue without
involving TAC. This document discusses the bas...