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Do not use the preconfigured SIP server port numbers (5060), if you want to make use of SIP server redundancy (“Locating SIP server with DNS according to RFC3263).
Background is RFC 3263: "...If the TARGET was not a numeric IP address, but a port is present in the URI, the client performs an A or AAAA record lookup of the domain name...."

Please look at this page to see a detailed communication flow.

N510 software version >=240

In the web-interface go to: Settings - Telephony - Connections - DNS SRV Lookup

Provisioning ParameterValue

SIP account 1:

BS_IP_Data1.ucB_SIP_USE_LOOKUP=0x1

Possibility to hide in web-interface:
BS_IP_Data1.ucB_SIP_USE_LOOKUP..attr=0x0

0x0 = No

0x1 = Yes

SIP account 2:

BS_IP_Data1.ucB_SIP_USE_LOOKUP_2=0x0

Possibility to hide in web-interface:
BS_IP_Data1.ucB_SIP_USE_LOOKUP_2..attr=0x0

0x0 = No

0x1 = Yes

SIP account 3:

BS_IP_Data1.ucB_SIP_USE_LOOKUP_3=0x0

Possibility to hide in web-interface:
BS_IP_Data1.ucB_SIP_USE_LOOKUP_3..attr=0x0

0x0 = No

0x1 = Yes

SIP account 4:

BS_IP_Data1.ucB_SIP_USE_LOOKUP_4=0x0

Possibility to hide in web-interface:
BS_IP_Data1.ucB_SIP_USE_LOOKUP_4..attr=0x0

0x0 = No

0x1 = Yes

SIP account 5:

BS_IP_Data1.ucB_SIP_USE_LOOKUP_5=0x0

Possibility to hide in web-interface:
BS_IP_Data1.ucB_SIP_USE_LOOKUP_5..attr=0x0

0x0 = No

0x1 = Yes

SIP account 6:

BS_IP_Data1.ucB_SIP_USE_LOOKUP_6=0x0

Possibility to hide in web-interface:
BS_IP_Data1.ucB_SIP_USE_LOOKUP_6..attr=0x0

0x0 = No

0x1 = Yes

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N510 software version < 240

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