android - UDP port 3526 Starquiz-port -


i installed linphone on galaxy s2 device , ran tcpdump on capture sip traffic linphone sending asterisk server. notice strange! sometime device sends special packet 3526 udp port asterisk server sip port (5060) contains:

0d0a0d0a

asci: 13101310. wireshark resolves port starquiz-port(this name not useful because clients use ephemeral ports). searched net port , starquiz found nothing useful. useful information found this link @ iana.does knows packet , why phone sends asterisk?

ps: in section 3.5.1 of rfc 5626 keep-alive using crlf mentioned connection oriented protocols:

crlf keep-alive technique
approach can used connection-oriented transports such tcp or sctp. client periodically sends double-crlf (the "ping") waits receive single crlf (the "pong"). if client not receive "pong" within appropriate amount of time, considers flow failed.

you softphone can use port.

that normal.

softphone or asterisk(if set qualify=yes) can send empty udp packet keeping nated connection active. normal.

i highly recommend read more sip before dooing softphone or other sip-related programming.


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