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error 779 shows up in ip phone when transfer to a hunt group failed.

We have a CME (C2800NM-SPSERVICESK9-M), Version 12.4(24)T3.  We have receptionist IP phone and a group of xx team phone setup. There is a hunt group for that group of xx team phones.

The receptionist phone is setup like this:

ephone-dn  102  dual-line
 number 279          <<<<DN for receptionist
 label xx
 description 279
 name  xxx
 corlist incoming SUPER
 huntstop channel
 hold-alert 30 originator

ephone  71
 mac-address xxxx
 username "x279" password xxx
 provision-tag 279
 type 7961 addon 1 7914 2 7914
 button  1:102 2m49 3m52 4m40
 button  5m7 6m105 7m114 8m11
 button  9m43 10m83 11m66 12m74
 button  13m48 14m38 15m54 16m104
 button  17m88 18m53 19m69 20m37
 button  21m41 22m80 23m60 24m56
 button  25m70 26m100 27m72 28m92
 button  29m71 30m110 31m61

The xx team's hunt pilot is DN 201:

ephone-hunt 20 longest-idle
 pilot 201
 list *, *, *, *, *, *, *, *, *, *, *, *
 final 775                 <<<<this is voicemail number
 timeout 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15
 no-reg pilot

1. If calling the reception phone (either from PSTN, or internally in the same site from a phone regiestered to the same CME),   the receptionist can pick the phone and talk, no problem. But if the receptionist transfers the call to ext. 201 (the pilot of hunt group). Intermittently, a few times a week, the call drops after being transferred. The receptionist sees 779 on her display, the callers hears a  message saying "There was a technical problem". It is not possible for the receptionist to take the call back. The client has to recall and then on the 2nd try to call is transferred OK.

If the receptionist transfer the call to the DN of individual member of the hunt group, transfer is good.

2. If caller calls the pilot direclty (either from PSTN, or from internal phone in the same CME),  the caller experienced the same issue as in the transfer case.

If caller calls the number of individual memeber of the hunt group, there is no problem.


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