CM Configuration for RingLeader
CUCM Version 188.8.131.520-1
There are a few default settings that need to be changed in the CUCM configuration for the SBC to function properly. This is meant to document these changes.
Service Parameter Changes:
Under System/Service Parameters/<CUCM Server>/Cisco CallManager (Active)/
Under Clusterwide Parameters (Device-SIP)
SIP Rel1XX Enabled – Change to “True”
“This parameter determines whether all SIP provisional responses (other than 100 Trying messages) get sent reliably to the remote SIP endpoint. If this parameter is disabled, Cisco CallManager does not acknowledge or confirm 18X messages. Valid values specify True (acknowledge 18X messages with PRACK) or False (do not acknowledge 18X messages with PRACK).” – Copied from context sensitive help in CUCM
SIP Trunk Security Profile Changes:
Under System/Security Profile/SIP Trunk Security Profile/
Change Outgoing Transport Type to “UDP”
Check “Accept Unsolicited Notification” – For Inbound DTMF Purposes
SIP Trunk Settings
Make sure “Redirecting Diversion Header Delivery – Inbound” is checked
Make sure “Redirecting Diversion Header Delivery – Outbound” is checked
Make sure the “SIP Trunk Security Profile” is the same as the one you modified above.
Make sure the “DTMF Signaling Method” is set to “OOB and RFC 2833”
Make sure “Wait for Far End H.245 Terminal Capability Support” is checked.
Make sure “Redirecting Number IE Delivery – Inbound” is checked
Make sure “Enable Inbound FastStart” is checked
Make sure “Display IE Delivery” is checked
Make sure “Redirecting Number IE Delivery – Outbound” is checked
Make sure “Enable Outbound FastStart” is NOT checked!