Digium, Inc.
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Chapter 3: Telephone System Configuration
RXFlash - Receive Flash Time defines the duration, in milliseconds,
that Asterisk requires in order to consider a flash operation that it
receives to be valid.
Codec Preference - Codecs provide the ability for your voice to be
converted to a digital signal and transmitted across the Internet. The
quality of your call can be affected by the choice you make. The
codecs available to you will depend on what is supported by the ser-
vice provider you choose. You can select the order in which the codecs
are used. The codecs commonly available are u-law, a-law, GSM,
G.726, G.722, and G.729A. A registered G.729A license is required in
order to use the G.729A codec.
MAC Address - The MAC Address field is used to specify the MAC
address of a PolyCom
®
phone connected to the Asterisk Appliance 50.
The MAC address associates the phone with this extension and
enables the auto-synchronization of provisioning information.
Line Number - Polycom brand VoIP phones are capable of servicing
1 to 6 separate VoIP phone lines, depending on the model of the
phone. If you are using the Polycom Auto-provisioning feature of the
Asterisk Appliance 50, this option can be used to define which line of
your phone will be used by the user. No more than one user can be
assigned to a line on a phone.
Note: Each phone must be configured with a user that has Line
Number set to 1. Additionally, assigned line numbers must be in a
contiguous range.
Line Keys - Polycom brand VoIP phones include multiple line keys.
The number of line keys available will depend on the model of the
phone. If you are using the Polycom Auto-provisioning feature of the
Asterisk Appliance 50, this option can be used to define how many
line keys on the phone should be associated with this user (e.g. Let’s
