Link Access Procedure, Channel D (LAPD)
Link Access Procedures on the D channel (LAPD), specified in ITU-T Q.920 and ITU-T Q.921, is the second layer protocol on the ISDN protocol stack in the D channel.
It is heavily based on HDLC.
The LAPD dissector is fully functional.
- Use GSM SAPI values. Default OFF.
- RTP payload type for embedded LAPD. Default 0, that means LAPD dissection in RTP packets is disabled.
Example capture file
A complete list of LAPD display filter fields can be found in the display filter reference
- Show only the LAPD based traffic:
You cannot directly filter LAPD protocols while capturing. XXX - is this true?