SIP 37SmartLink M-ATA Getting Started Guide 5 • TelephonySIP ConfigurationFigure 12. SIP Configuration section of the SIP windowSIP Server SettingsThe SmartLink M-ATA will automatically attempt to locate the VoIP server by using the domain name speci-fied in the LAN interface or the server will be discovered via DHCP on the WAN interface. When found, thediscovered server will be listed as the Current Server.Enter the following information:• Server address—The IP address or domain name hosting the VoIP SIP server• Port—The UDP port of the VoIP SIP server. The default is 5060.• Domain name—The VoIP domain name (realm) is used for validation of each phone’s username• Send Registration Request with Expire Time—If selected, determines the amount of time (in seconds) thatthe SIP registration will be valid for.• Unregistration—If checked, the SmartLink will send a SIP unregister at system reload before sending a SIPregistration request.• Send SUBSCRIBE—If checked, the SmartLink will send a SIP subscribe to the server specified. This boxmust be checked for the voicemail message counted and message waiting notification to work.• SUBSCRIBE Server IP or FQDN—The IP address or fully qualified domain name of the subscription ser-vice. If not specified, the SIP subscribes to the SIP server.Figure 13. Gateway Settings section of the SIP windowGateway SettingsDial Plan. Refer to appendix C, “Dial plans” on page 80