YXD-OS2
1.Save phone charges, less than one cent per minute;
2.High qulity of connection
3.There are two lan

Call flow is llike:
1. Make Call
SIP ATA--> OpenSky --> SkypePSTN
2.Receive Call
PSTN(SkypeIn)--> OpenSky -->Sip ATA

1. OpenSky Features
1.Call Skype users using mappings/speed dial or use SkypeOut to make PSTN calls
2.Make SIP calls from Skype using a SIP provider or SIP PBX
3.Skype callers can be directed to the SIP address of your choice
4.SIP callers can be directed to the Skype user of your choice Please contact sales for details!
5.Connect Asterisk, Elastix, trixbox, 3CX or other SIP PBX to Skype Users
6.Auto play pre-recorded file(s) to SIP and Skype callers
7.Multiple calls - other calls placed on hold.
8.Can be setup as a multi channel Skype to Asterisk Trunk for multiple simultaneous calls

2. Application
1. Skype Trunking:
Skype Incoming : Receive Skype calls from customers who are using Skype.
Outgoing to Skype : Make free calls to numerous Skype users by office phone.
SkypeOut: Provide trunks of making landline/mobile calls.
2.Interoffice Trunking: Builds enterprise branch communications network through Skype with optimal design .
3.Remote Extension:
Use Skype as Fixed Remote Extension.
include a SIP Server, it can work as Asterisk/IPPBXs SIP Trunk or SIP Extension.
Remote monitoring and managing by Web.
Independent Phonebook Utility includes public & private phonebook.
Optional Multi-User mode feature allows every user to create his own private contacts.
Play the auto attendant for Skype incoming call, and forward it to extension or Skype.
Call Log & Call Statistics.
Database sharable among cascade connection
Backup and restore functions of database.