Gateways

Answered Question
Feb 16th, 2008
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Hi All,

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

Correct Answer by paolo bevilacqua about 9 years 5 months ago

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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Correct Answer
paolo bevilacqua Sat, 02/16/2008 - 03:17
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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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