A communication system comprising: a first communication device; a communication server configured to host a communication service; a first network communicatively connectable to the communication server; a second network communicatively connectable to the communication server; the first communication device communicatively connectable to the communication server to utilize the server via a first transmission path that is configured to pass through the second network; and a survivability proxy device communicatively connectable to the communication server, communicatively connectable to the second network and communicatively connectable to the first communication device; and the first communication device configured to register with at least one of the survivability proxy device and the communication server such that the first communication device utilizes the communication service hosted by the communication server by exchanging communications with the communication server via the first transmission path, the first transmission path being configured to traverse the second network; the survivability proxy device configured to determine that the second network experienced a failure such that the first communication device is unable to utilize the second network for utilization of the communication service hosted by the communication server; the survivability proxy device configured to send a survivability notification to at least one of the first communication device and a survivability gateway device assigned to the first communication device; one of the survivability proxy device and survivability gateway device being configured to send a survivability registration message to the communication server via a second transmission path that traverses the first network; in response to receipt of the survivability registration message, the communication server being configured to replace an initial route set for the first communication device that is configured to define an initial route path comprising the first transmission path along which the communication server sends communications to the first communication device with a survivability route set identified by the received survivability registration message, the survivability route set being configured to define a survivability route path comprising the second transmission path. a first communication device; a communication server configured to host a communication service; a first network communicatively connectable to the communication server; a second network communicatively connectable to the communication server; the first communication device communicatively connectable to the communication server to utilize the server via a first transmission path that is configured to pass through the second network; and a survivability proxy device communicatively connectable to the communication server, communicatively connectable to the second network and communicatively connectable to the first communication device; and the first communication device configured to register with at least one of the survivability proxy device and the communication server such that the first communication device utilizes the communication service hosted by the communication server by exchanging communications with the communication server via the first transmission path, the first transmission path being configured to traverse the second network; the survivability proxy device configured to determine that the second network experienced a failure such that the first communication device is unable to utilize the second network for utilization of the communication service hosted by the communication server; the survivability proxy device configured to send a survivability notification to at least one of the first communication device and a survivability gateway device assigned to the first communication device; one of the survivability proxy device and survivability gateway device being configured to send a survivability registration message to the communication server via a second transmission path that traverses the first network; in response to receipt of the survivability registration message, the communication server being configured to replace an initial route set for the first communication device that is configured to define an initial route path comprising the first transmission path along which the communication server sends communications to the first communication device with a survivability route set identified by the received survivability registration message, the survivability route set being configured to define a survivability route path comprising the second transmission path.