INVITE message.
 [1] Redirect = Use the same call identifiers.
Web/EMS: Enable P-
Charging Vector
[EnablePChargingVector]
Enables the inclusion of the P-Charging-Vector header to all outgoing
INVITE messages.
 [0] Disable (default)
 [1] Enable
Web/EMS: Retry-After
Time
[RetryAfterTime]
Defines the time (in seconds) used in the Retry-After header when a
503 (Service Unavailable) response is generated by the device.
The time range is 0 to 3,600. The default value is 0.
Web/EMS: Fake Retry
After [sec]
[FakeRetryAfter]
Determines whether the device, upon receipt of a SIP 503 response
without a Retry-After header, behaves as if the 503 response included a
Retry-After header and with the period (in seconds) specified by this
parameter.
 [0] Disable (default)
 Any positive value (in seconds) for defining the period
When enabled, this feature allows the device to operate with Proxy
servers that do not include the Retry-After SIP header in SIP 503
(Service Unavailable) responses to indicate an unavailable service.
The Retry-After header is used with the 503 (Service Unavailable)
response to indicate how long the service is expected to be unavailable
to the requesting SIP client. The device maintains a list of available
proxies, by using the Keep-Alive mechanism. The device checks the
availability of proxies by sending SIP OPTIONS every keep-alive
timeout to all proxies.
If the device receives a SIP 503 response to an INVITE, it also marks
that the proxy is out of service for the defined "Retry-After" period.
Web/EMS: Enable P-
Associated-URI Header
[EnablePAssociatedURIH
eader]
Determines the device usage of the P-Associated-URI header. This
header can be received in 200 OK responses to REGISTER requests.
When enabled, the first URI in the P-Associated-URI header is used in
subsequent requests as the From/P-Asserted-Identity headers value.
 [0] Disable (default)
 [1] Enable
Note: P-Associated-URIs in registration responses is handled only if the
device is registered per endpoint (using the User Information file).
Web/EMS: Source Number
Preference
[SourceNumberPreferenc
e]
Determines from which SIP header the source (calling) number is
obtained in incoming INVITE messages.
 If not configured (i.e., empty string) or if any string other than "From"
or "Pai2" is configured, the calling number is obtained from a specific
header using the following logic:
a. P-Preferred-Identity header.
b. If the above header is not present, then the first P-Asserted-
Identity header is used.
c. If the above header is not present, then the Remote-Party-ID
header is used.
d. If the above header is not present, then the From header is
used.
 "From" = The calling number is obtained from the From header.
 "Pai2" = The calling number is obtained using the following logic:
a. If a P-Preferred-Identity header is present, the number is
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