dbb4090d_Internal_Error_Codes___DocWiki__Descriptor
[Code] 2 [Explanation] Packet or buffer memory is exhausted. This condition may indicate a temporary overload or a memory leak caused by faulty software. [Category] 181 [Descriptor] 
No buffers
Cisco IOS Voice Troubleshooting and Monitoring -- Cisco VoIP Internal Error Codes - DocWiki