ALE M3-M5-M7-M8 DeskPhones Administrator Guide
Menu → Advanced Setting (default password: 123456) → Account → AccountX → SIP
Server2
It configures the port of secondary server in which the accountX use to register.
Account → Basic → Secondary SIP Port
It configures the registration expiration time (in seconds) of secondary server for accountX.
Account → Basic → Secondary Register Expire Time
AccountXOutboundProxy2Address
It configures the IP address or domain name of the secondary outbound proxy server for
accountX.
String within 256 characters
Account → Basic → Secondary Outbound Proxy Address
Menu → Advanced Settings → Account → AccountX → Outbound Proxy2
AccountXOutboundProxy2Port
It configures the IP address or domain name of the secondary outbound proxy server for
accountX.
Account → Basic → Secondary Outbound Proxy Port
8.3 SIP Server Name Resolution
If a domain name is configured for a server, the IP address associated with that domain name will be
resolved through DNS as specified by RFC 3263. The DNS query involves NAPTR, SRV and A queries,
which allow the IP phone to adapt to various deployment environments. The IP phone performs NAPTR
query for the NAPTR pointer and transport protocol (UDP, TCP and TLS), the SRV query on the record
returned from the NAPTR for the target domain name and the port number, and the A query for the IP
addresses.