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66xx/67xx Router Users Guide 148
proxy. This is an additional proxy through which all outgoing calls are directed. In some
cases, the outbound proxy is placed alongside the firewall and is the only way to let SIP
traffic pass from the internal network to the Internet. When SIP Outbound Proxy is selected,
the following fields appear.
SIP Outbound Proxy: The IP address of the outbound proxy.
SIP Outbound Proxy port: The port that the outbound proxy is listening on. By default, the port
value is 5060.
Use SIP Registrar: Select the checkbox of Use SIP Registrar to register with the proxy. You can
register your user ID on the SIP registrar. SIP registrar works with SIP proxy, allowing other
parties to call DSL router through it. When it is selected, the following fields appear.
SIP Registrar: The IP address of the SIP registrar.
SIP Registrar port: The port that SIP registrar is listening on. By default, the port value is 5060.
Account Enabled: If Account Enabled is not selected, the corresponding account is disabled.
You can not use the account to initiate or accept any call.
Polarity Reverse Enable: Enable or disable this function.
Authentication name: Set the user name of authentication.
Password: Set the password of authentication.
Cid Name: User name. It is the Display Name.
Cid Number: Set the caller number. It must be a number of 0~9.
ptime: You can use the ptime parameter to set the packetization time (PT). The PT is the length
of the digital voice segment that each packet holds. The default setting is to create 20
millisecond packets. Selecting 10 milliseconds for the parameter may improve the voice
quality. Because of the packet loss, less information is lost, but because there are more
packets and a smaller payload to overhead ratio per packet, selecting 10 milliseconds puts a
heavier load on the network traffic.
Priority: The priority of codec is defined in a range from 1-100. Codecs define the method of
relaying voice data. Different codecs have different characteristics, such as data compression
and voice quality. For Example, G723 is a codec that uses compression, therefore, it is a
good option when bandwidth is limited, however the voice quality for G723 is not good as
other codecs, such as the G711. If no codec is specified, the DSL router chooses the codec
automatically.