To dial Orbtalk from another provider:
**(Provider SIP broker access string)*7579 <Account>
To dial another provider from Orbtalk:
**757*(Provider SIP broker code)<Account>
You can obtain the SIP code from: http://www.sipbroker.com/sipbroker/action/providerWhitePages
Search for the provider and the SIP code will be shown.
To obtain the SIP broker access string, please contact your provider.