What do IAM, ACM, ANC and REL mean? RLC message

IAM: It is the initial address request message sent by the calling subscriber to the called subscriber.

ACM: The called party replies to the caller's address right message, indicating whether the called party replies to the caller's availability.

ANC: If you are called off-hook, you can charge.

REL: Disconnect the message after the user hangs up.

RLC: This is the message that the signal on the link is released after the connection is disconnected.

ANC is the called response message and charges at the same time. And a free message. Ann's answer.

ACB access rejection signal

Automatic congestion control signal message

ACM address complete message, including six signals:

ADC: Full address, billing?

ADN: full address, free of charge

ADX: full address, coin-operated user

AFC: complete address, free of charge and billing.

AFN: full address, free and free.

AFX: full address, free, coin-operated users

ADI address incomplete signal

ANC response signal, charging.

Answer the signal safely, free of charge.

ANU response signal, unclassified

BLA block confirmation signal

BLO blocking signal

BSM reverse setup request signal

CBK hang-up signal

CCF conduction fault signal

CCL Caller Hang-up Signal (domestic optional)

CCM circuit test information

CCR request conduction test signal

CFL call fault signal

Congestion signal of CGC circuit group

CHG charging message

CLF disconnect signal

Kurt conduction signal

CRA calls the user off-hook signal again.

Called user idle message

CRM closes user group selection and confirmation response message.

Call monitoring message

CVM closes the user group confirmation check message.

CVS closes the user group selection and confirmation check request message.

CNM circuit network management message

DPN does not provide digital path signals.

EAM extended response message indication

EUM extension reverse establishment unsuccessful information message

FAM forwarding address message

FOT forwarding signal

FSM forwarding setup message

GRA circuit group recovery confirmation message

GRM circuit group monitoring message

GRQ general request message

GRS circuit group recovery message

GSM universal forwarding setup information message

HBA chunk acknowledgement message due to hardware failure

Due to hardware failure, HGB's group blocked messages.

Group unlock message of HGU due to hardware failure.