| Parameter | Type | Length (octets) | |
|---|---|---|---|
| Message type | F | 1 | |
| Range and status | V | 2 | (The status subfield is not present) |
Circuit Group Reset message (GRS): A message sent to release an identified group of circuits when, due to memory mutilation or other causes, it is unknown whether for example, a release or release complete message is appropriate for each of the circuits in the group. If at the receiving end a circuit is remotely blocked, reception of this message should cause that condition to be removed.
Circuit group Query Message (CQM): A message sent on a routine or demand basis to request the far-end exchange to give the state of all circuits in a particular range.