Roblem with socket_process: Call rejected by 127.0.0.1: Busy

Hi
I am not sure why this is happening or whether it has anything to do with my iaxmodem setup. When receiving a fax via iaxmodem, I got an error message saying chan_iax2.c:7542 socket_process: Call rejected by 127.0.0.1: Busy

From faxstat -s, I get:
JID Pri S Owner Number Pages Dials TTS Status
58 123 S root 008675533661 0:2 4:12 02:12 No carrier detected

Here is the asterisk output:
[Mar 28 01:54:00] NOTICE[16753]: chan_iax2.c:6025 update_registry: Restricting registration for peer ‘iaxmodem’ to 60 seconds (requested 50)
– ast_get_srv: SRV lookup for ‘_sip._udp.voipuser.org’ mapped to host sip.voipuser.org, port 5060
– Accepting AUTHENTICATED call from 127.0.0.1:
> requested format = alaw,
> requested prefs = (),
> actual format = alaw,
> host prefs = (alaw),
> priority = mine
– Executing [0033661681@fax-out:1] NoOp(“IAX2/iaxmodem-1”, “we are at fax-out”) in new stack
– Executing [0033661681@fax-out:2] Dial(“IAX2/iaxmodem-1”, “SIP/callwithus/0033661681”) in new stack
– Called callwithus/008675533661681
– Starting simple switch on ‘Zap/1-1’
– SIP/callwithus-082370a8 is making progress passing it to IAX2/iaxmodem-1
[Mar 28 01:54:56] NOTICE[16754]: chan_iax2.c:6025 update_registry: Restricting registration for peer ‘iaxmodem’ to 60 seconds (requested 50)
– Executing [s@incoming:1] Answer(“Zap/1-1”, “”) in new stack
– Executing [s@incoming:2] NoOp(“Zap/1-1”, “incoming number is “” <>”) in new stack
– Executing [s@incoming:3] Wait(“Zap/1-1”, “10”) in new stack
– SIP/callwithus-082370a8 answered IAX2/iaxmodem-1
– Redirecting Zap/1-1 to fax extension
== Spawn extension (incoming, fax, 0) exited non-zero on ‘Zap/1-1’
– Executing [fax@incoming:1] Answer(“Zap/1-1”, “”) in new stack
– Executing [fax@incoming:2] NoOp(“Zap/1-1”, “getting fax”) in new stack
– Executing [fax@incoming:3] Goto(“Zap/1-1”, “fax|s|1”) in new stack
– Goto (fax,s,1)
– Executing [s@fax:1] Answer(“Zap/1-1”, “”) in new stack
– Executing [s@fax:2] NoOp(“Zap/1-1”, “we are at fax”) in new stack
– Executing [s@fax:3] Dial(“Zap/1-1”, “IAX2/iaxmodem”) in new stack
– Called iaxmodem
[Mar 28 01:54:59] WARNING[16753]: chan_iax2.c:7542 socket_process: Call rejected by 127.0.0.1: Busy
– Hungup ‘IAX2/iaxmodem-4’
== Everyone is busy/congested at this time (1:0/0/1)
== Auto fallthrough, channel ‘Zap/1-1’ status is ‘CHANUNAVAIL’
– Hungup ‘Zap/1-1’
== Spawn extension (fax-out, 0033661681, 2) exited non-zero on ‘IAX2/iaxmodem-1’
– Hungup ‘IAX2/iaxmodem-1’

Please help me. Really appreciate it.

Thanks,
Mark