SIP Provider DE
- 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)