International calling from home through the office

I am managing a lot of international venfors overseas from US.  Some of them I have weekly calls 8AM.  The other ones cannot do on the specific days.  So I need to skip and then the projects and tasks get delayed.
I don't have an international plan on my cell phone. Is there a way to call the compay's office phone from home and call international from there?
Other idea to have Skype calls but I don't think the vendos are using that.
Any other ideas?
Thanks.
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Tiras25Asked:
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agonza07Commented:
Feature you are looking for is called DISA. What type of phone system do you have?
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Tiras25Author Commented:
Polycom phones.  SoundPoint IP 335.
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agonza07Commented:
What about the actual system behind the phones?

You may need to contact your vendor to get that set up for you.

If it's a cisco system the feature may be called "Mobile Voice Access"

here's a brief description of DISA. It's for an Asterisk phone system.
http://www.asterisk.org/docs/asterisk/trunk/applications/disa
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Tiras25Author Commented:
I know service is onsip.
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agonza07Commented:
Looks like a hosted solution. You should just order an office phone for you home.

Or contact OnSIP, they seem to have an App that for mobile phones.

http://www.onsip.com/features

OnSIP is completely standards based, meaning that you can use your business phone service on any mobile user agent in addition to your desk phone. Mobile VoIP (SIP client) apps can be downloaded on many of today's smartphones and configured with your OnSIP account.
How do I get it?
Simply download the mobile VoIP / SIP Client app of your choosing on your mobile device, and configure it with your OnSIP user credentials. Please be sure to visit our mobile VoIP page for mobile application reviews and the full details. Also check out our video demo of OnSIP on the iPhone with the Bria app.
How much?
Free! With OnSIP, a VoIP app on your mobile phone is just another type of phone you can register. Each user can register up to ten different devices whether it is a desk phone, a softphone, or a mobile application.
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Tiras25Author Commented:
Interesting information about the onsip.  Let me review this and close the question soon.  Thank you.
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