Cisco has revamped its professional network design certification, Cisco Certified Design Professional (CCDP), to be more in line with the host of new services and applications that network pros must ...

The last blog entry covered DTMF relay. This blog entry will focus on Cisco IP Phone and Cisco SIP Trunk DTMF relay support. Cisco’s first generation of IP phones do not support RFC2833 DTMF-Relay.