pri通话过程中掉线

不好意思，前面发错了板块，没找到删除的地方
open卡DE410P
asterisk-1.4.21.2
libpri-1.4.7
zaptel-1.4.12.1


通话过程中出现
[Aug 14 20:59:08] VERBOSE[2057] logger.c: -- Requested transfer capability: 0x00 - SPEECH
[Aug 14 20:59:08] VERBOSE[2057] logger.c: -- Called g2/1313XXXXXX
[Aug 14 20:59:08] VERBOSE[2057] logger.c: -- Zap/3-1 is proceeding passing it to Zap/2-1
[Aug 14 20:59:08] DEBUG[2057] chan_zap.c: Received AST_CONTROL_PROCEEDING on Zap/2-1
[Aug 14 20:59:16] VERBOSE[2057] logger.c: -- Zap/3-1 is ringing
[Aug 14 20:59:23] VERBOSE[2057] logger.c: -- Zap/3-1 answered Zap/2-1
[Aug 14 21:00:20] DEBUG[2057] chan_zap.c: Started VLDTMF digit '1'
[Aug 14 21:00:20] DEBUG[2057] chan_zap.c: Ending VLDTMF digit '1'
[Aug 14 21:00:37] DEBUG[2057] chan_zap.c: Set option AUDIO MODE, value: ON(1) on Zap/3-1
[Aug 14 21:00:37] DEBUG[2057] chan_zap.c: Not yet hungup... Calling hangup once with icause, and clearing call
[Aug 14 21:00:37] DEBUG[2057] chan_zap.c: Set option AUDIO MODE, value: OFF(0) on Zap/3-1
[Aug 14 21:00:37] VERBOSE[2057] logger.c: -- Hungup 'Zap/3-1'

请问下是什么原因造成的呢，卡需要有什么特别的设置么？