# BCF Library Limitations

The following limitations apply to BCF Library:

Limitation | Description
IPBCP (Q1970) | Messages: Request and Accepted Messages only (no Confused Message, no Rejected Message) No IPBCP Timers No IP bearer modification No Alternative Network Address Type (no IPv6)
Q1990 (Tunneling Protocol) | No support for abnormal procedures.
Q765.5 (BAT ASE) | Support for the following BAT ASE information elements: Action Indicator IE Codec List IE Single Codec IE Bearer Network Connection Characteristics IE Bearer Control Tunneling IE Bearer Control Unit Identifier IE Bearer Control Information IE (Tunneled IPBCP) Backbone Network Connection Identifier Inter-working Function Address No support for the following BAT ASE information elements (the BCF library ignores these information elements if they are received in a BCF message): BAT Compatibility Report Signal Bearer Redirection Capability Bearer Redirection Indicators Signal Type Duration
Q765.5 | No segmentation/re-assembly.
APM User Application | APM’2000 (not APM’98).