For the practical issues such as getting the running implementation and other questions that are more of a general nature, please use email address support@ilbcfreeware.org for those issues. Additionally, please use mentioned email address as well in order to provide a feedback about found bugs in the code etc. For the issues that might be of a general interest such as possible improvements, interoperability issues etc. please use avt mailing list.
Mailing lists are the easiest way to get community's feedback on the specific that are of a general interest, such as possible improvements of iLBC, interoperability issues etc.
Here some of the resources that we think You might find useful for work related to iLBC:
IETF avt WG drafts and RFCs; avt mailing list archive
Henning Schulzrinne's RTP page
Public domain SIP client running iLBC - Kphone
Public domain SIP stack and lot more - vovida.org
Asterisk is an open source software IP-PBX, dual-licensed by Digium under the GPL or a commercial license - Asterisk
Public domain H323 stack and a lot more - OpenH323.org