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vty: update desc of conn-timeout

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It can be used together with LCLS, just make sure to also enable
keep-alive packets.

In OS#3429 it was pointed out, that during LCLS the media path remains
active but is not used. Without any traffic flowing, this looks like a
timed out connection and so it will be killed if conn-timeout is set.

However, OsmoBSC and OsmoMSC have an option to enable RTP keep-alive
packets (through libosmo-mgcp, originally intended to keep connections
behind NAT open). If that option is enabled, the keep-alive packets
should also prevent the conn-timeout.

Related: OS#3783
Change-Id: Ib4d19104d558a26a444a80fb36f4b7b33bc5cc59
This commit is contained in:
Oliver Smith
2019-06-26 12:08:20 +02:00
parent d2ce444008
commit 189f29e939
1 changed files with 2 additions and 1 deletions
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3
src/libosmo-mgcp/mgcp_vty.c
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@@ -1382,7 +1382,8 @@ DEFUN(cfg_mgcp_conn_timeout,
"conn-timeout <0-65534>",
"Set a time after which inactive connections (CIs) are closed. Set to 0 to disable timeout. This can be used to"
" work around interoperability problems causing connections to stay open forever, and slowly exhausting all"
" available ports. Do not enable when LCLS is used (connections in LCLS state appear to be inactive)!\n"
" available ports. Enable keep-alive packets in MGW clients when using this option together with LCLS (OsmoBSC,"
" OsmoMSC: 'rtp keep-alive')!\n"
"Timeout value (sec.)\n")
{
g_cfg->conn_timeout = strtoul(argv[0], NULL, 10);