(CUCM Version Used for Screenshots: 126.96.36.19900-26)
System --> Security --> Sip Trunk Security Profile
Copy the ‘Non Secure SIP Trunk Profile’, enter a new name: For example: ‘CUC SIP Security Profile’. Leave everything else to default.
Either change the ‘Default’ one or create a new one.
Advanced Features --> Voicemail --> Voice Mail Profile
Now again, either change the ‘Default’ one or create a new one.
‘Redirecting Diversion Header Delivery – Inbound’ in the ‘Inbound Calls’ section and
SIP Profile is a required field, you can select ‘Standard SIP Profile’ for this purpose. Save the trunk configuration.
Put in the Voice Mail Pilot DN here as the Route Pattern and select the SIP Trunk created in the previous step.
At this time, CUCM side of configuration is complete. However, make sure the phones are configured for the phone Voice Mail profile which was created. And they are configured to send un-answered calls to the voice mail.
(CUC Version Used for Screenshots: 188.8.131.5200-26)
Telephony Integrations --> Phone System
Add a new one or select the existing one
You can also change the codec advertising if needed.
Note 1: SIP Integration of CUC and CUCM doesn't have MWI On/Off DNs. SIP Integration uses SIP NOTIFY messages to turn ON/OFF the MWI on the phone.
Note 2: Ports dictate how many concurrent sessions can occur between CUCM and CUC. In this example, maximum of 3 sessions would exist between CUCM and CUC (for example 3 people would be able to check voicemail at one time because we are using 3 ports or 2 people can check voice mail and one auto attendant session, or any other combination)
PS: Until CUC version 8, number of ports was dictated by license. From CUC 9 and later, this is no longer a licensed feature. Ports now depend on the hardware/hardware OVA template used.
For CUC 11.x, check this URL for the maximum number of ports supported: