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Can a Call Disconnection cause Q.850, can made a call not considered to be billed?

There are some valid/good (answered) calls (Connect and realese signals sent/received), with duration, that have disconnect cause 27  (destination out of order) (H323 Protocol)…

·         How can that be explained?

·         What is the real purpose and significance of cause 27  (destination out of order)?

·         Why do real-good answered calls end with disconnection cause 27

·         Why should calls with disconnection cause 27 be accepted, and billed?

·         Is there regulation that may consider that disconnection causes are used to determine if a call is billable?

·         Do you know any kind of document – white paper - call flow that may explain clearly this situation (like ITU regulation - standard or from a different organization)

·         Is it correct to conclude that calls with duration which cleared with disconnection cause 27 are non billable?

Thank you very much for your cooperation on this matter.

1 REPLY
Cisco Employee

Re: Can a Call Disconnection cause Q.850, can made a call not co

Typically calls are only billed if they go to a connect state.  Any call that fails during ringdown (which is what I would expect here for this cause) should have the audio for the error cut through with a progress with a PI of 8 and never proceed to a connect state.


You should not be billed for this call, because this error signifies the call can't even get delivered to the remote party.  From the q.850 spec:

This cause indicates that the destination indicated by the user cannot be reached because the interface to the destination is not functioning correctly. The term "not functioning correctly" indicates that a signalling message was unable to be delivered to the remote party; e.g. a physical layer or data link layer failure at the remote party, or user equipment offline

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