Outbound Dialing Problem -- TE121P

Hi all,

i am having some issues with outbound dialing, some times i immediately busy congestion tone while dialing outside

[May 13 09:58:23] VERBOSE[5714] logger.c: – Executing [90504525243@from-internal-servicecntr:1] Set(“SIP/88525-b6839030”, “CALLERID(all)=8222”) in new stack
[May 13 09:58:23] VERBOSE[5714] logger.c: – Executing [94525243@from-internal-servicecntr:2] Dial(“SIP/88525-b6839030”, “Zap/g1/4525243”) in new stack
[May 13 09:58:23] VERBOSE[5714] logger.c: – Requested transfer capability: 0x00 - SPEECH
[May 13 09:58:23] VERBOSE[5714] logger.c: – Called g1/4525243
[May 13 09:58:23] DEBUG[5714] chan_zap.c: Set option AUDIO MODE, value: ON(1) on Zap/4-1
[May 13 09:58:23] DEBUG[5714] chan_zap.c: Already hungup… Calling hangup once, and clearing call
[May 13 09:58:23] DEBUG[5714] chan_zap.c: Set option AUDIO MODE, value: OFF(0) on Zap/4-1
[May 13 09:58:23] VERBOSE[5714] logger.c: – Hungup ‘Zap/4-1’
[May 13 09:58:23] VERBOSE[5714] logger.c: == Everyone is busy/congested at this time (1:0/0/1)

Also
b]chan_zap.c: Already hungup… Calling hangup once, and clearing call[/b]
What it means?
Regards,
Haroon Feroze