[Asterisk-Users] cannot hear voice from phone

[xf du]

I just installed a Asterisk PBX,and want to test with it.
I have two IP-Phones,and they can call eachother use Asterisk.
Now my question is:
when the phone call connected,I can't hear any voice from the phone.I don't know why.
I have no sound-card in my PC,is it must required?





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