I was recently troubleshooting the iLBC codec negotiation issues between a MGCP Gateway & CIPC Phones in my environment. Unlike the regular Codecs, you need to enable iLBC ( and AMR-NB Codec) for an MGCP Gateway to use it during the codec negotiation phase.
Here is a good Cisco Link for the same:
http://www.cisco.com/en/US/docs/ios/12_4t/12_4t15/it_amrnb.html#wp1054638
HTH.
Mann
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