[asterisk-users] Questions on IAX client

[asterisk asterisk]

Hi,

I used to use Zoiper IAX to connect to my asterisk server from remote site.
On asterisk CLI, I can see my zoiper client registered and stay on line.
HOwever, I don't know why now I can't call this client. It always show up as
"Unable to create channel IAX2 (Cause 20 Unknown)

I am using Asterisk 1.8.7.1

CK
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