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SIP Release Notes 90 Document #: LTRT-26901
CPE SIP Products
Parameter Description
CRLF Keep-Alive Mode Parameters
[UsePingPongKeepAlive]
Determines whether the carriage-return and line-feed sequences
(CRLF) Keep-Alive mechanism, according to RFC 5626 “Managing
Client-Initiated Connections in the Session Initiation Protocol (SIP)” is
used for reliable, connection-orientated transport types such as TCP.
[0] Disable (default)
[1] Enable
The SIP user agent/client (i.e., device) uses a simple periodic
message as a keep-alive mechanism to keep their flow to the proxy or
registrar alive (used for example, to keep NAT bindings open). For
connection-oriented transports such as TCP/TLS this is based on
CRLF. This mechanism uses a client-to-server "ping" keep-alive and a
corresponding server-to-client "pong" message. This ping-pong
sequence allows the client, and optionally the server, to tell if its flow is
still active and useful for SIP traffic. If the client does not receive a
pong in response to its ping, it declares the flow “dead” and opens a
new flow in its place. In the CRLF Keep-Alive mechanism the client
periodically sends a double-CRLF (the "ping") then waits to receive a
single CRLF (the "pong"). If the client does not receive a "pong" within
an appropriate amount of time, it considers the flow failed.
Note: The device sends a CRLF message to the Proxy Set only if the
Proxy Keep-Alive feature (EnableProxyKeepAlive parameter) is
enabled and its transport type is set to TCP or TLS. The device first
sends a SIP OPTION message to establish the TCP/TLS connection
and if it receives any SIP response, it continues sending the CRLF
keep-alive sequences.
Ping-Pong Keep-Alive Time
[PingPongKeepAliveTime]
Defines the periodic interval (in seconds) after which a “ping” (double-
CRLF) keep-alive is sent to a proxy/registrar, using the CRLF Keep-
Alive mechanism.
The default range is 5 to 2,000,000. The default is 120.
The device uses the range of 80-100% of this user-defined value as
the actual interval. For example, if the parameter value is set to 200
sec, the interval used is any random time between 160 to 200
seconds. This prevents an “avalanche” of keep-alive by multiple SIP
UAs to a specific server.
RTCP XR Parameters
Enable RTCP XR
[VQMonEnable]
Enables voice quality monitoring and RTCP XR, according to draft-ietf-
sipping-rtcp-summary-13.
[0] Disable = Disable (default)
[1] Enable = Enables
Note: For this parameter to take effect, a device reset is required.
Minimum Gap Size
[VQMonGMin]
Voice quality monitoring - minimum gap size (number of frames). The
default is 16.
Burst Threshold
[VQMonBurstHR]
Voice quality monitoring - excessive burst alert threshold. if set to -1
(default), no alerts are issued.
Delay Threshold
[VQMonDelayTHR]
Voice quality monitoring - excessive delay alert threshold. if set to -1
(default), no alerts are issued.