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CUCM 8.6: Display "unknown" when call from PSTN to IP Phone (SCCP) and display IP of CUCM when call from PSTN to IP SIP Phone

Dear All,

We're using CUCM Version 8.6 and mgcp gateway Cisco 2921 with FXO port. We're facing these problem:

1. When the first call from PSTN to IP SCCP Phone via FXO port, we see the number. But from the 2nd call, we see "unknown". We do shut/no shut on voice-port, and we only the the number at the first call, from the 2nd call, we always see "unknown". How can we solve this problem?

2. When call from PSTN to IP SIP Phone via FXO port, we always see the IP of CUCM.  How can we solve this problem?

We've opened TAC for weeks and nothing new.

How can we solve this problem?

2 REPLIES
New Member

CUCM 8.6: Display "unknown" when call from PSTN to IP Phone (SCC

Can any one help us?

Hall of Fame Super Gold

CUCM 8.6: Display "unknown" when call from PSTN to IP Phone (SCC

MGCP limitations with caller-id on FXO ports are well known, even if Cisco claims to have resolved them that doesn;t appears to be the case.

If you want full support for FXO ports on CUCM, use H.323 or SIP, not MGCP. Otherwise, open a TAC case, and good luck.

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