Hi Anis,
Your unity connection port group name should be CiscoUM1.
You also need to create a hunt list, hunt pilot number, and line group for voicemail and assign the CiscoUM1 group. You then need to ensure your voicemail ports/extension are assigned to the Line Group.
Your line group name in CUCM should be "CiscoUM1", Ports names in CUCM should be i.e
CiscoUM1-VI1, CiscoUM1-VI2, CiscoUM1-VI3, etc
CUCM Setup:
Unity Connection Setup:
HTH, Please rate helpful posts
Regards,
Justin