tree 2fbfa354db8458c878d22b0fed0baa4e567ef74d
parent 34bdc9f8fe3862ce3213820d356a8ebbc45b7362
author Jacob Erlbeck <jerlbeck@sysmocom.de> 1387475587 +0100
committer Holger Hans Peter Freyther <holger@moiji-mobile.com> 1389874851 +0100

mgcp: Send RTP keepalive dummy packets to net

So far, a single dummy packet has been sent immediately after the
reception of a MDCX message. There is no dedicated keep alive
mechanism (it just worked because the audio from the MS has always
been forwarded to the NAT until the 'mgcp: Set output_enabled flags
based on the MGCP mode' patch).

This patch adds explicit, timer based keep alive handling that can be
enable per trunk. A VTY command 'rtp keep-alive' command is added for
configuration which can be used to set the interval in seconds, to
send a single packet after the reception of a CRCX/MDCX when RTP data
from the net is expected ('once'), or to disable the feature
completely ('no rtp keep-alive'). In 'send-recv' connections, only
the initial packet is sent if enabled (even when an interval has been
configured). The default is 'once'.

Note that this removes the mgcp_change_cb() from mgcp_main.c.

Sponsored-by: On-Waves ehf