Mgcp for help

aaln/1 , aaln/2 registration success.
aaln/1 call aaln/2 , aaln/2 ring , but aaln/1 can not hear ring-back tone ,
when aaln/2 offhook , aaln/1 and aaln/2 hang up automatic.

– MGCP mgcp_new(MGCP/aaln/2@newrock-1) created in state: Down
– Executing [6001@default:1] Dial(“MGCP/aaln/2@newrock-1”, “MGCP/aaln/1@newrock”) in new stack
– MGCP mgcp_request(aaln/1@newrock)
– MGCP cw: 0, dnd: 0, so: 0, sno: 0
– MGCP mgcp_new(MGCP/aaln/1@newrock-1) created in state: Down
– Called MGCP/aaln/1@newrock
– MGCP/aaln/1@newrock-1 is ringing
– MGCP/aaln/1@newrock-1 answered MGCP/aaln/2@newrock-1
– MGCP mgcp_answer(MGCP/aaln/2@newrock-1) on aaln/2@newrock-1
– Remotely bridging MGCP/aaln/2@newrock-1 and MGCP/aaln/1@newrock-1
NOTICE[1853]: chan_mgcp.c:2804 handle_response: Terminating on result 400 from aaln/1@newrock-1