c8fa26c0_Internal_Error_Codes___DocWiki__Descriptor
[Code] 14 [Explanation] The gateway or signaling interfaces are being taken out of service (forcefully or gracefully). A possible cause may be the signaling interface required to support the call has already been administratively shut down. [Category] 187 [Descriptor] 
Gateway or interface OOS
Cisco IOS Voice Troubleshooting and Monitoring -- Cisco VoIP Internal Error Codes - DocWiki
Descriptor