Cisco SPA942-RC Administration Guide - Page 256
Network Settings, NAT Keep Alive Dest
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SPA and Wireless IP Phone Field Reference Ext Tab B Parameter NAT Keep Alive Msg NAT Keep Alive Dest Description Enter the keep alive message that should be sent periodically to maintain the current NAT mapping. If the value is $NOTIFY, a NOTIFY message is sent. If the value is $REGISTER, a REGISTER message without contact is sent. Defaults to $NOTIFY. Destination that should receive NAT keep alive messages. If the value is $PROXY, the messages are sent to the current or outbound proxy. Defaults to $PROXY. Network Settings Parameter SIP TOS/DiffServ Value SIP CoS Value RTP TOS/DiffServ Value RTP CoS Value Description TOS/DiffServ field value in UDP IP packets carrying a SIP message. Defaults to 0x68. CoS value for SIP messages. Defaults to 3. ToS/DiffServ field value in UDP IP packets carrying RTP data. Defaults to 0xb8. CoS value for RTP data. Defaults to 6. Cisco SPA and Wireless IP Phone Administration Guide 254