CUCM 8.6 can't get inbound and outbound calls

[Ayushjav Lkhagvasuren]

Hi everyone. We have cisco CUCM 8.6 and C2951 router for gateway. We also have E1 for the telco line. It worked perfectly before. But now it can't call outside from the CUCM and also can't call from outside to CUCM. When i call to CUCM main number (telco number) it tells "The number you dialed doesn't dxist". What can i do right now? Where can i start? Could you guys please help

Thanks in advance,

[Nadeem Ahmed]

Have you collected new debugs for incoming calls ? and did you check with PSTN as well ?

Br,
Nadeem 

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[Ayushjav Lkhagvasuren]

Dear Nadeem ,

Very thanks to you for helping me. We restarted the CUCM and it works perfectly. So it is not any configuration related error. But I still don't know what causes this kind of problem. So could you please tell me why it works fine after only restart?

[Ayushjav Lkhagvasuren]

Dear all ,

Very thanks to you guys for helping me. We restarted the CUCM and it works perfectly. So it is not any configuration related error. But I still don't know what causes this kind of problem. So could you guys please tell me why it works fine after only restart?