Administrator’s Guide for SIP-T2 Series/T4 Series/T5 Series/CP920 IP Phones
212
Permitted
Values
0, Integer from 60 to 65535
Default -1, the IP phone will invoke “account.X.sip_server.Y.failback_timeout” to take effect.
Parameter
account.X.outbound_proxy.Y.failback_sub-
scribe.enable
[1][2]
<MAC>.cfg
Description
It enables or disables the IP phone to retry to re-subscribe after registering to the secondary outbound
proxy server with different IP addresses when encountering a failover.
Note: It works only if “account.X.outbound_proxy.Y.failback_mode” is set to 1, 2 or 3.
Permitted
Values
0-Disabled
1-Enabled, the IP phone will immediately re-subscribe to the secondary outbound proxy server, for ensur-
ing the normal use of the features associated with subscription (for example, BLF, SCA).
Default -1, the IP phone will invoke “account.X.sip_server.Y.failback_subscribe.enable” to take effect.
Parameter
account.X.sip_server.Y.outbound_proxy_enable
[1][2]
<MAC>.cfg
Description
It enables or disables the IP phone to use outbound proxy server address configured by “accoun-
t.X.outbound_proxy.Y.address”.
Note: It works only if “account.X.outbound_proxy_enable” is set to 1 (Enabled).
Permitted
Values
0-Disabled
1-Enabled
Default 1
[1]
X is the account ID. For T54S/T48S/T48G/T46S/T46G/T29G, X=1-16; for T52S/T42G/T42S, X=1-12; for T41P/T41S/T27G,
X=1-6; for T40P/T40G/T23P/T23G, X=1-3; for T21(P) E2, X=1-2; for T19(P) E2/CP920, X=1.
[2]
Y is the server ID. Y=1-2.
SIP Server Name Resolution
If a domain name is configured for a server, the IP address(es) 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 allows the IP phone
to 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 name
and 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 transport
type is set to DNS-NAPTR, NAPTR and SRV queries will be tried before falling to A query. If no port is found through
the DNS query, 5060 will be used.
Topic
SIP Server Name Resolution Configuration
SIP Server Name Resolution Configuration
The following table lists the parameters you can use to configure SIP server name resolution.
Parameter
account.X.sip_server.Y.transport_type
[1][2]
<MAC>.cfg
Description It configures the type of transport protocol.
Permitted
0-UDP
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