[Freeswitch-users] iLBC codec 97 or 102

Hi, We have FreesSWITCH runing on version 11066, which INVITE with iLBC@30i number 102, however the recent version INVITE with iLBC@30i number 97. Unfortunately I have a broken sip client only talks with RTP payload 102. So here is the question: 1) What's the difference between 97 and 102? The default value changed since version 11066? 2) Is it configurable? Is it part of sofia-lib or FS? Thank you.