How to make SIP Calls between different VoIP Service Providers(VSP)?

1. Call accountnumber@vsp.com
2. If one vsp is peering with the other, we can call the access code of the 2nd vsp and the account number.

For example: With voipuser.org, we can call FWD by dialing *393FWDNumber.

3. If one vsp does not directly peer with the other one, they may peer with SIP Broker. Anyone that peers with SIP Broker can call a user with 2nd vsp by dialing the SIP Code of the 2nd and the user’s account number.

For example, with FWD, we can call voipuser account by dialing **275*431VoipuserNumber.

275is the sip code of sipbroker.com. 431 is the sip code of voipuser.org on SipBroker.

4. One can also call another sip user with a traditional pstn phone by calling the SipBroker PSTN Access number first if available. At the voice prompt, dial sip code and account number.

If one wants to set up a sip phone, check http://faq.sipbroker.com.

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