Linksys WIP310 SPA500 Series and WIP310 IP Phone Administration Guide - Page 284

Cisco SPA 500 Series and Wireless IP Phone Field Reference Ext Tab B Parameter Register Expires Ans Call Without Reg Use DNS SRV DNS SRV Auto Prefix Proxy Fallback Intvl Description Allow answering inbound calls without successful (dynamic) registration by the unit. If proxy responded to REGISTER with a smaller Expires value, the phone will renew registration based on this smaller value instead of the configured value. If registration failed with an Expires too brief error response, the phone will retry with the value given in the Min-Expires header in the error response. Defaults to 60. If enabled, the user does not have to be registered with the proxy to answer calls. Defaults to no. Whether to use DNS SRV lookup for Proxy and Outbound Proxy. Defaults to no. If enabled, the phone will automatically prepend the Proxy or Outbound Proxy name with _sip._udp when performing a DNS SRV lookup on that name. Defaults to no. This parameter sets the delay (sec) after which the phone will retry from the highest priority proxy (or outbound proxy) servers after it has failed over to a lower priority server. This parameter is useful only if the primary and backup proxy server list is provided to the phone via DNS SRV record lookup on the server name. (Using multiple DNS A record per server name does not allow the notion of priority and so all hosts will be considered at the same priority and the phone will not attempt to fall back after a fail over). Defaults to 3600 Cisco SPA 500 Series and WIP310 IP Phone Administration Guide 273