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Cisco Bug: CSCvi13686 - ISR4K - Outbound faxes originating from certain fax servers may fail to send.

Last Modified

Oct 25, 2019

Products (1)

  • Cisco IOS

Known Affected Releases


Description (partial)

Call Flow
Fax Server (3rd Party) -- SIP -- CUCM -- SIP -- ISR4K -- PRI -- PSTN
Fax Protocol T.38

The fax will train correctly and start to send the first page.  However, the ISR4K will stop sending the page in the middle even though it received the entire page data in the T.38 messaging.

Happens when the page data from the fax server arrives in larger data blocks
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Bug Details Include

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  • Status
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