Circuit busy ??

I was trying to place some test calls to my cell phone and upon dialing they were marked as "Circuit busy" not sure why or how but a reboot fixed the problem. Isnt there a script that runs to clear the lines once in awhile? Perhaps channel 1 was stuck.
== Manager 'sendcron' logged on from 127.0.0.1
-- Executing AGI("Local/913057815757@default-91bd,2", "agi://127.0.0.1:4577/call_log") in new stack
-- AGI Script agi://127.0.0.1:4577/call_log completed, returning 0
-- Executing Dial("Local/913057815757@default-91bd,2", "Zap/g1/3057815757||To") in new stack
-- Requested transfer capability: 0x00 - SPEECH
-- Called g1/3057815757
-- Zap/1-1 is proceeding passing it to Local/913057815757@default-91bd,2
-- Channel 0/1, span 1 got hangup request, cause 34
-- Zap/1-1 is circuit-busy
-- Hungup 'Zap/1-1'
== Everyone is busy/congested at this time (1:0/1/0)
-- Executing Hangup("Local/913057815757@default-91bd,2", "") in new stack
== Spawn extension (default, 913057815757, 3) exited non-zero on 'Local/913057815757@default-91bd,2'
-- Executing DeadAGI("Local/913057815757@default-91bd,2", "agi://127.0.0.1:4577/call_log--HVcauses--PRI-----NODEBUG-----34-----CONGESTION----------") in new stack
-- AGI Script agi://127.0.0.1:4577/call_log--HVcauses ... ---------- completed, returning 0
== Parsing '/etc/asterisk/manager.conf': Found
== Manager 'sendcron' logged on from 127.0.0.1
-- Executing AGI("Local/913057815757@default-91bd,2", "agi://127.0.0.1:4577/call_log") in new stack
-- AGI Script agi://127.0.0.1:4577/call_log completed, returning 0
-- Executing Dial("Local/913057815757@default-91bd,2", "Zap/g1/3057815757||To") in new stack
-- Requested transfer capability: 0x00 - SPEECH
-- Called g1/3057815757
-- Zap/1-1 is proceeding passing it to Local/913057815757@default-91bd,2
-- Channel 0/1, span 1 got hangup request, cause 34
-- Zap/1-1 is circuit-busy
-- Hungup 'Zap/1-1'
== Everyone is busy/congested at this time (1:0/1/0)
-- Executing Hangup("Local/913057815757@default-91bd,2", "") in new stack
== Spawn extension (default, 913057815757, 3) exited non-zero on 'Local/913057815757@default-91bd,2'
-- Executing DeadAGI("Local/913057815757@default-91bd,2", "agi://127.0.0.1:4577/call_log--HVcauses--PRI-----NODEBUG-----34-----CONGESTION----------") in new stack
-- AGI Script agi://127.0.0.1:4577/call_log--HVcauses ... ---------- completed, returning 0
== Parsing '/etc/asterisk/manager.conf': Found