Php 错误：处理呼叫失败！（在设置Plivoframework和freeswitch时）

安装freeswitch和plivoframework时，在plivo出站中发现问题。当我使用软电话从freeswitch调用plivo时，plivo-outbound.log文件给出了以下错误日志。此外，freeswitch工作正常，plivo和freeswitch之间的接口没有问题

plivo-outbound.log:

2014-08-04 16:12:52,422 plivo-outbound[26271]: INFO: (2) Requested RESTXML to http://127.0.0.1/answer/
2014-08-04 16:12:52,422 plivo-outbound[26271]: ERROR: (2) Processing Call Failure !
2014-08-04 16:12:52,422 plivo-outbound[26271]: ERROR: (2) Unrecognized Element: ['speak']
2014-08-04 16:12:52,450 plivo-outbound[26271]: ERROR: (2) Traceback (most recent call last):
2014-08-04 16:12:52,450 plivo-outbound[26271]: ERROR: (2) Traceback (most recent call last):
2014-08-04 16:12:52,450 plivo-outbound[26271]: ERROR: (2)     self.process_call()
2014-08-04 16:12:52,450 plivo-outbound[26271]: ERROR: (2)   File "/usr/local/plivo/src/plivo/src/plivo/rest/freeswitch/outboundsocket.py", line 500, in process_call
2014-08-04 16:12:52,450 plivo-outbound[26271]: ERROR: (2)     self.lex_xml()
2014-08-04 16:12:52,450 plivo-outbound[26271]: ERROR: (2)   File "/usr/local/plivo/src/plivo/src/plivo/rest/freeswitch/outboundsocket.py", line 599, in lex_xml
2014-08-04 16:12:52,450 plivo-outbound[26271]: ERROR: (2)     % invalid_element)
2014-08-04 16:12:52,450 plivo-outbound[26271]: ERROR: (2) UnrecognizedElementException: Unrecognized Element: ['speak']
2014-08-04 16:12:52,450 plivo-outbound[26271]: INFO: (2) Processing Call Ended
2014-08-04 16:12:52,450 plivo-outbound[26271]: DEBUG: (2) Releasing Connection ...
2014-08-04 16:12:52,451 plivo-outbound[26271]: DEBUG: (2) Releasing Connection Done
2014-08-04 16:12:52,451 plivo-outbound[26271]: INFO: (2) End request from ('127.0.0.1', 48645)

然而，我试图从plivo运行以下脚本，它位于

[loopbackip]/answer/index.php

-位置

<?xml version="1.0" encoding="UTF-8" ?>
<Response>
   <speak>welcome</speak>
</Response>

欢迎

---

你知道怎么解决吗？

经过一天的混乱，我终于发现错误不在plivo脚本和安装中。这是在我的index.php脚本中-每个关键字如

，…

都应该以大写字母开头。 现在脚本看起来像：

index.php

<?xml version="1.0" encoding="UTF-8" ?>
<Response>
   <Speak>welcome</Speak>
</Response>

欢迎