Problems when using SJphone with Cisco 1750

Here is onother one way question.

I am trying to deploy Cisco 1750 with two FXO VIC cards, and I ran into
a strange problem. When I dial using SJphone and g711u, I can hear
sound coming from PSTN, but the other side gets nothing. When I tried
with X-lite, everything works fine.

Since this is a test, I excluded all that can be a problem. There is no
NAT (everything is in one network).

Best regar ..
Telecom, Cabling and VoIP continues...