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Yes, SIPStation offers Fax over IP (FoIP) using the T.38 fax relay for Standard SIP trunking customers but not Premium trunking customers as outlined here Difference Between Standard and Premium Trunking. T.38 specifies a protocol for real-time transmission of fax over IP networks. Faxing in SIPStation is always done on a best-effort basis, and SIP/VoIP has plenty of known issues with faxing, so you will want to test it to make sure it works for you. We recommend that you confirm the quality is acceptable before porting an existing fax number to SIPStation.

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