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SIP Provider 1&1 Versatel (DE)
SIP Provider 1&1 Voice SIP (DE)
SIP Provider Autphone (DE)
SIP Provider AXXESS (DE)
SIP Provider BITel (DE)
SIP Provider callio.net (AT/DE)
SIP Provider COLT (DE)
SIP Provider Deutsche Telefon (DE)
SIP Provider Deutsche Telekom, Call & Surf Connection (DE)
SIP Provider Deutsche Telekom, CompanyFlex (DE)
SIP Provider Deutsche Telekom, SIP Trunk & SIP Trunk Pure (DE)
SIP Provider Deutsche Telekom, VoiceData Connection (DE)
SIP Provider DNS:NET (DE)
SIP Provider DOKOM21 (DE)
SIP Provider easybell (DE)
SIP Provider echtschnell (DE)
SIP Provider ecotel sipTrunk2.0 (DE)
SIP Provider EmslandTel.net (DE)
SIP Provider Envia TEL (DE)
SIP Provider equada GmbH (DE)
SIP Provider EWETEL (DE)
SIP Provider Gamma Communications, NGN (DE)
SIP Provider GELSEN-NET (DE)
SIP Provider gnTel (DE)
SIP Provider inexio (DE)
SIP Provider intersaar (DE)
SIP Provider ITK Connect (UK)
SIP Provider M-net (DE)
SIP Provider MDCC (DE)
SIP Provider MK Netzdienste (DE)
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