Is posible connect and register a cisco phone in PC port of another cisco phone

We are installing a voice gateway (ISR4351) with E1, and the device is comunicated with CUCM through SIP trunk. The calls from IPPhones are coming to the device, but when te call is transferred to E1 through dial-peers, the call is not working. These...

We are installing an Expressway-E with the capacity of B2B calls, but when it calls from internet to expressway public IP the call shows "unreacheable". the log, only shows:     Search (275) State: Completed Found: False Reason: Address Incomplete ...

We have installed a CMS with H323 module which call to Huawei. When the CMS stablish the call, the image is pixelated. Exist some behavior between two servers that generate this error? Some parameter to modify?

We are installed a CMS to integrate with Lync. Inicially, the integration is working fine, but now the calls don't connect. When we verify the General status in the CMS, we find the Lync Edge Registration "in progress". In any moment the register is ...