Add force_send_silence_when_idle channel variable

If set to true, this prevents us from overriding the value of
send_silence_when_idle.  When that is unset or set to zero and SRTP is
engaged, we typically override the value because many devices can't
handle gaps in the SRTP stream.

This variable is mostly for testing whether particular devices can
handle this behavior.  Use at your own risk.

diff --git a/src/switch_rtp.c b/src/switch_rtp.c
index b84795b91b22b7d6459d23364b2aff4d25b68703..b8da56b984a3bf975bb88987b754a2bf26d483c9 100644 (file)
--- a/src/switch_rtp.c
+++ b/src/switch_rtp.c
@@ -3042,8 +3042,10 @@ SWITCH_DECLARE(switch_status_t) switch_rtp_add_crypto_key(switch_rtp_t *rtp_sess
        memset(policy, 0, sizeof(*policy));
 
        /* many devices can't handle gaps in SRTP streams */
-       if (!(var = switch_channel_get_variable(channel, "send_silence_when_idle"))
-               || !(atoi(var))) {
+       if (!((var = switch_channel_get_variable(channel, "force_send_silence_when_idle"))
+                 && switch_true(var))
+               && (!(var = switch_channel_get_variable(channel, "send_silence_when_idle"))
+                       || !(atoi(var)))) {
                switch_channel_set_variable(channel, "send_silence_when_idle", "-1");
        }