Version 7.2 599 Mediant 500L Gateway & E-SBC
User's Manual 27. Configuring Supplementary Services
27.12.2 Precedence Ring Tone
You can assign a ring tone that is defined in the CPT file to be played when a precedence
call is received from the IP side. This is configured by the PrecedenceRingingType
parameter. You can configure the duration for which the device plays a preemption tone to
the Tel and IP sides if a call is preempted, using the PreemptionToneDuration parameter.
Emergency Telecommunications Services (ETS) calls (e.g., E911) can be configured with
a higher priority than any MLPP call (default), using the E911MLPPBehavior parameter.
27.13 Denial of Collect Calls
You can configure the device to reject (disconnect) incoming Tel-to-IP collect calls and to
signal this denial to the PSTN. This capability is required, for example, in the Brazilian
telecommunication system to deny collect calls. When the feature is enabled upon rejecting
the incoming call, the device sends a sequence of signals to the PSTN. This consists of an
off-hook, an on-hook after one second, and then an off-hook after two seconds. In other
words, this is in effect, a double-answer sequence.
This feature can be enabled for all calls, using the EnableFXODoubleAnswer "global"
parameter, or it can be enabled for specific calls, by enabling this feature in a Tel Profile.
Note:
• This feature is applicable only to FXO interfaces.
• If automatic dialing is also configured for an FXO port enabled with Denial of
Collect Calls, the FXO line does not answer the incoming call (ringing) until a SIP
200 OK is received from the remote destination. When a 200 OK is received, a
double answer is sent from the FXO line.
• Ensure that the PSTN side is configured to identify this double-answer signal.
27.14 Configuring Multi-Line Extensions and
Supplementary Services
The Supplementary Services table lets you configure up to 100 supplementary services for
endpoints connected to the device. These endpoints include FXS phones and Integrated
Services Digital Network (ISDN) Basic Rate Interface (BRI) phones.
You can use the table for the following functionalities:
Configuring multiple phone line extension numbers per port, supporting point-to-
multipoint configuration of several phone numbers per channel.
Registration of each line extension (endpoint), using a user-defined user ID and
password, to a third-party softswitch for authentication and/or billing. For each line
extension, the device sends a SIP REGISTER to the softswitch, using the global
number in the From/To headers. If authentication is necessary for registration, the
device sends the endpoint’s user ID and password in the SIP MD5 Authorization
header. For viewing registration status, see ''Viewing Registration Status'' on page
899.
BRI call forwarding services for point-to-multipoint configurations (according to ETSI
300 207-1) - Call Forward Busy (CFB), Call Forward No Reply (CFNR), and Call
Forward Unconditional (CFU).
Caller ID name per line extension, which is displayed to the called party (if enabled).
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