How to Play sound to other end while answering a call?

[happyzengbo]

Hi all,

I have written the following code:

#coding: utf-8

import telephone,audio,e32,appuifw

app_lock = e32.Ao_lock()
def quit():
    app_lock.signal()


appuifw.app.exit_key_handler = quit
appuifw.app.title = u"电话测试"

CALL_STATE = {telephone.EStatusUnknown:          u"unknown",
              telephone.EStatusIdle:             u"空闲",
              telephone.EStatusDialling:         u"拨号中",
              telephone.EStatusRinging:          u"响铃中",
              telephone.EStatusAnswering:        u"应答中",
              telephone.EStatusConnecting:       u"呼叫中",
              telephone.EStatusConnected:        u"已经连线",
              telephone.EStatusReconnectPending: u"reconnect pending",
              telephone.EStatusDisconnecting:    u"断线",
              telephone.EStatusHold:             u"保持",
              telephone.EStatusTransferring:     u"呼叫转移中",
              telephone.EStatusTransferAlerting: u"transfer alerting"};


sound = audio.Sound.open("E:\\Sounds\\Digital\\Plain.mp3")

def play_sound():
    sound.play() # I got error on this line

#play_sound()    


def handle_call(tuple):
    status = tuple[0]
    print u"当前状态:"+CALL_STATE[status]
    if status == telephone.EStatusRinging:
        #play_sound()
        e32.ao_sleep(1)
        telephone.answer()
        print u"来电话啦！接啦！"
        e32.ao_sleep(1,play_sound)

    elif status == telephone.EStatusConnected:
        e32.ao_sleep(1)
        #telephone.
        #audio.say(u"Hello, Goodbye")
        #telephone.hang_up()

    #app_lock.signal()

telephone.incoming_call()
telephone.call_state(handle_call)

app_lock.wait()

I want to automatically answer incoming calls and play sound to the other end. but I got an error :

[Error -21] Error Playing file : KErrAccessDenied.

I then tried to open signed my sis file , but the error remains. So why ?

I use N82, the s60 version is 31.1.016, and the mp3 file absolutely exists. I can play it using the following code:

#coding: utf-8

import audio

s = audio.Sound.open("E:\\Sounds\\Digital\\Plain.mp3")
s.play()