Administrator’s Guide for W60P/W53P/W41P DECT Phones106DescriptionIt enables or disables the IP phone to retry to re-subscribe after registering to the secondary server withdifferent IP addresses when encountering a failover.Note: It works only if "account.X.sip_server.Y.failback_mode" is set to 1, 2 or 3.PermittedValues0-Disabled1-Enabled, the IP phone will immediately re-subscribe to the secondary server, for ensuring the normaluse of the features associated with the subscription (for example, BLF, SCA).Default 0Parameter account.X.outbound_proxy.Y.register_on_enable[1][2] .cfgDescription It enables or disables the IP phone to register to the secondary outbound proxy server before sendingrequests to it when encountering a failover.PermittedValues0-Disabled, the IP phone will not attempt to register to the secondary outbound proxy server, since thephone assumes that the primary and secondary outbound proxy servers share registration information. Sothe IP phone will directly send the requests to the secondary outbound proxy server.1-Enabled, the IP phone will register to the secondary outbound proxy server first, and then send therequests to it.Default -1, the IP phone will invoke “account.X.sip_server.Y.register_on_enable” to take effect.[1]X is the account ID. X=1-8.[2]Y is the server ID. Y=1-2.SIP Server Name ResolutionIf a domain name is configured for a server, the IP address(es) associated with that domain name will be resolvedthrough DNS as specified by RFC 3263. The DNS query involves NAPTR, SRV and A queries, which allows the IP phoneto adapt to various deployment environments. The IP phone performs NAPTR query for the NAPTR pointer and trans-port protocol (UDP, TCP and TLS), the SRV query on the record returned from the NAPTR for the target domain nameand the port number, and the A query for the IP addresses.If an explicit port (except 0) is specified, A query will be performed only. If a server port is set to 0 and the transporttype is set to DNS-NAPTR, NAPTR and SRV queries will be tried before falling to A query. If no port is found throughthe DNS query, 5060 will be used.TopicSIP Server Name Resolution ConfigurationSIP Server Name Resolution ConfigurationThe following table lists the parameters you can use to configure SIP server name resolution.Parameter account.X.sip_server.Y.transport_type[1][2] .cfgDescription It configures the type of transport protocol.PermittedValues0-UDP1-TCP2-TLS3-DNS-NAPTR, if no server port is given, the IP phone performs the DNS NAPTR and SRV queries for the
