CHAPTER68 Configuration Parameters Reference
Mediant 1000 Gateway & E-SBC | User's Manual
Parameter Description
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 (defined by the
PingPongKeepAliveTime parameter) 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.
configure voip > sip-
definition proxy-and-
registration > 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.
'Max Generated Register Rate'
configure voip > sip-
definition proxy-and-
registration > max-gen-
reg-rate
[MaxGeneratedRegistersRate]
Defines the maximum number of user register requests
(REGISTER messages) that the device sends (to a
proxy or registrar server) at a user-defined rate
configured by the GeneratedRegistersInterval
parameter. The parameter is useful in that it may be
used to prevent an overload on the device's CPU
caused by sending many registration requests at a
given time.
The valid value is 30 to 300 register requests per
second. The default is 150.
For configuration examples, see the description of the
GeneratedRegistersInterval parameter.
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