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Gateways

Hi All,

Can you please explain the difference between the Q921 and Q931 debugging in Gateway.

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Hall of Fame Super Gold

Re: Gateways

Q921 is isdn layer 2, an hdlc-family protocol that ensures messages are reliably sent between router and switch.

Q931 is isdn layer 3 and is used to for the actual call messages, o top of layer 2.

Depending on where you suspect the problem is, you enable one or another, sometime both.

1 REPLY
Hall of Fame Super Gold

Re: Gateways

Q921 is isdn layer 2, an hdlc-family protocol that ensures messages are reliably sent between router and switch.

Q931 is isdn layer 3 and is used to for the actual call messages, o top of layer 2.

Depending on where you suspect the problem is, you enable one or another, sometime both.

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