Archive for February, 2011

When configuring a CUCM for SIP Trunk there may not be an SDP listed in the initial SIP Invite as it egresses the network.  If this is the case then the far end SIP endpoint receiving the call from CUCM will try and establish the codec type by including SDP in the 200 OK message […]

Cisco IOS contains a configurable object called SIP User Agent (sip-ua) where several different SIP settings may be altered from their default behavior.  The focus here are the settings for SIP Retry Invite and SIP Timers and why it makes sense to change the default settings on the router if calls should reroute over another […]