Siproxd error

[tier3]

Hello!

we have a simple setup with single wan and one Lan network. Just the default installation with Siproxd and ntopng installed.

seeing following error in system log and some of the calls are dropping

siproxd[88241]: rtpproxy_relay.c:686 ERROR:rtp_relay_start_fwd: no RTP port available or bind() failed

can someone throw some light on this.

thanks
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fyi - we have multiple ATA voip devices in LAN connecting to voip server on internet.