If you want the SNR call on your mobile to go to the voicemail of you mobile phone, the voicemail should kick in before CUCM disconnects the call.
I think the CFNA timer for cellular providers is different and so if you have Orange or SFR the call is not going to VM but if you have Bouyguess it goes to VM.
There is a timer in CUCM under the device > remote destination.
"Answer Too Late Timer". By default this is 19000 miliseconds. Increase it to say 50,000 or 100,000 and see if then the call goes to VM of the cell phone.
Also, you will have to bear in mind that you will need to incread the CFNA timer in CUCM as well so that the CUCM VM does not kick in before cellular VM. You can play around with that under the directory number page on CUCM. The field you can tweak is "No Answer Ring Duration".
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