I am getting this error when I am sending more than 200 call files in outgoing folder of asterisk.
[May 9 05:13:51] ERROR: res_rtp_asterisk.c:495 ast_rtp_new: Oh dear... we couldn't allocate a port for RTP instance '0x7f9844972448'
[May 9 05:13:51] NOTICE: channel.c:5487 __ast_request_and_dial: Unable to request channel SIP/bypass/919414930662
[May 9 05:13:51] NOTICE: pbx_spool.c:360 attempt_thread: Call failed to go through, reason (0) Call Failure (not BUSY, and not NO_ANSWER, maybe Circuit busy or down?)
What does this mean ?