Abstract: We describe a system embodiment comprising generating a Secure Real-Time Transport Protocol (SRTP) encapsulated packet and including a secure media indicator into the SRTP encapsulated packet. The method further comprises inserting the SRTP encapsulated packet into an SRTP voice stream associated with an active call between a source and a destination endpoint and indicating an end-to-end secure call between the source and destination endpoints responsive to the secure media indicator. And we describe a method embodiment comprising transmitting a request message from a source endpoint to a destination endpoint participating in an active call and setting a secure media flag in the request message at each node in a signaling path associated with the active call. The method further comprises returning a response message from the destination endpoint to the source endpoint responsive to the request and indicating an end-to-end secure call between the two endpoints.

Abstract: We describe an example system including a wireless cellular channel to transmit voice data associated with a call between a server and a wireless device. A wireless signaling channel, distinct from the wireless cellular channel, transmits supplementary signaling packets between the server and the wireless device.

Abstract: Various embodiments provide methods and systems operable to receive a VoIP signaling packet, the VoIP signaling packet including information indicative of a request for trace information, to append trace information to the VoIP signaling packet; and to route the VoIP signaling packet with the trace information to a next network element on a path to a destination node. If an error condition is encountered, the VoIP signaling packet with the trace information is routed to a previous network element on a path to a source node.

Abstract: A method of providing failover service to network phones. A failure of communication between a network phone and a primary call manager is identified. Communication is established with a default network device and directory information is provided to the default network device. The network phones needing failover service then use the directory constructed at the default network device as a failover call manager.

Abstract: A method of providing failover service to network phones. A failure of communication between a network phone and a primary call manager is identified. Communication is established with a default network device and phone configuration information is provided to the default network device. The network phones needing failover service then use the directory constructed at the default network device as a failover call manager.