Hi,

Is there a way in Sipp to simulate CRLF Keep-alive?

It's a TCP packet with no SIP header containing only   '\r\n' '\r\n'.

See RFC 5626 section 3.5.1 : https://tools.ietf.org/html/rfc5626#section-3.5.1
3.5.1<https://tools.ietf.org/html/rfc5626#section-3.5.1>.  CRLF Keep-Alive 
Technique

   This approach can only be used with connection-oriented transports

   such as TCP or SCTP.  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.

Thank you,

Shimon


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