Nokia E65 Internet Calls

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Nokia E65 Internet Calls Manual pdf 10 page image

Internet calls10 Copyright © 2007 Nokia. All rights reserved.translation, not port mapping. This requires an external IPaddress for each simultaneous connection. Broadbandrouters often use this feature to allow a designatedcomputer to accept all external connections even whenthe router itself uses the only available external IPaddress.STUNSTUN (Simple Traversal of User Datagram Protocol (UDP)Through Network Address Translators (NATs)) is a networkprotocol allowing a client behind a NAT (or multiple NATs)to find out its public address, the type of NAT it is behindand the Internet side port associated by the NAT with aparticular local port. This information is used to set upUDP communication between two hosts that are bothbehind NAT routers.STUN is a client-server protocol. Nokia E65 includes aSTUN client which will send a request to a STUN server.The server then reports back to the STUN client the publicIP address of the NAT router, and the port opened by theNAT to allow incoming traffic back in to the network.The response also allows the STUN client to determinewhat type of NAT is in use, as different types of NATshandle incoming UDP packets differently.Protocols like SIP use UDP packets for the transfer ofsound/video/text signaling traffic over the Internet.As both endpoints are often behind NAT, a connectioncannot be set up in the traditional way. This is whereSTUN is useful.Emergency callsYour device attempts emergency calls primarily overcellular networks. If an emergency call using cellularnetworks is not successful, your device attempts anemergency call through your Internet call provider. Due tothe established nature of cellular telephony, you shoulduse cellular networks for emergency calls, if possible. Ifyou have cellular network coverage available, make surethat your cellular phone is switched on and ready to makecalls before you attempt an emergency call. The capabilityfor an emergency call using Internet telephony depends onthe availability of a WLAN network and your Internet callprovider's implementation of emergency call capabilities.Contact your Internet call provider to check the Internettelephony emergency call capability.

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