SIP client cannot connect to endpoint

Hi guys,
I just bought your GSM bridge, specification:

Model Name:	VS-GGU-E2M0400
GSM Modem Description:	GSM:850/900/1800/1900MHz
Software Version:	1.1.9
Hardware Version:	Date 2012-11-09 FPGA 11 Hardware 00

Manual say there should be 4 endpoints. There are none. Anyway, I've configured them according to the manual with all defaults (names, passwords, etc). But my SIP clients cannot connect, error message is SIP 404. What's the way to fix it?

I am afraid you did not configure the device in right way, there is no SIP endpoints as default, you need to create it based on your needs. pls read manuals here:
http://downloads.openvox.cn/pub/manuals/Release/English/

Hi,
I have configured them according to the manual, but it didn't work anyway.

Contact me via IM and prepare TeamViewer access.