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The Gigaset pro Interoperability Program is designed to test Gigaset pro PBXs when connected to ITSP (Service Provider) SIP Trunks. If you are missing local Providers you can contact the local Technical Sales Representative in your country.

SIP Trunking for Gigaset PBX Systems

Select your country for a list of ITSPs which have been tested for Gigaset pro Interoperability:

ITSP TestingLink to tested providersLink to tested providersLink to tested providers

Country
France
Germany	Link to tested providers
Greece	Link to tested providers
Netherlands	Link to tested providers
Switzerland
United Kingdom