The NANP dial plan has been discussed in the past four blogs. By default, Cisco Unified Communications Manager (CUCM) does not know how to route any calls to the PSTN based on the NANP or any other ...

Since there is no automatic TFTP configuration file download functionality to SIP third party clients, the SIP third party client must be configured with a SIP proxy server address of CUCM’s IP ...

Cisco Systems on Wednesday shipped a high priority fix for its Cisco Unified Communications Manager software, formerly known as CallManager. Cisco gave the flaw, which allows remote code executions, a ...

Telephony Application Programming Interface, or TAPI, allows applications to control the telephone services in Windows. To use TAPI with Cisco CallManager, install the Cisco TAPI Service, or TSP, ...