SIP Trunking services

Skype for Business enables connectivity to the Public Switched Telephone Network (PSTN) directly over SIP to provide flexible unified communication capability with reduced cost. Certified for Skype for Business SIP trunking services help enterprises to connect their on-premises Skype for Business infrastructure to external PSTN network in a highly scalable way. Skype for Business provides the most reliable PSTN interconnectivity with SIP trunk providers.

The following table lists the SIP trunking services that are certified for Skype for Business.

Carrier Service Name Qualified with TLS & SRTP
Accelerated Connections ACI SIP Trunk
Altibox Altibox SIP Trunk
AT&T AT&T IP Flexible Reach Service
Bandwidth SIP Voice Services
Brightlink IP Brightlink IP SfB Enterprise
Broad-Connect SIP Trunking
BroadSoft Adaption OfficeTrunk
BROKERTEAM SIP Trunk Brokerteam - Winvision Voice
BT Global Services BT One Voice
CallPlus Services Ltd. SIP Trunk
C3NTRO Lync SIP Connect
CCI Network Services CCI_SFB
Cebod Telecom Business SIP Trunking / Cloud PBX
Cincinnati Bell Business / CBTS SIP Trunking
Circuit ID Cloud SIP
TDC Erhverv Skype for Business Trunk
Colt Technology Services VoIP Access
Columbus Business Solutions CBS Cloud Voice
Comscentre Comscentre Sip Connect for Microsoft Lync
Elisa SIP Trunking
Fujitsu SIP Trunk
G12 Communications Lync SIP Trunks
Gamma SIP Trunking
GlobalConnect GlobalConnect SIP Trunking
IntelePeer IntelePeer SIP Trunking
Internet Solutions Internet Solutions SIP Trunk
Interoute Interoute One
ipvision a/s VIP Trunk
Kordia Onkor Voice
Level 3 Level 3 Communications SIP Trunking
Magnetic North Cloud PBX
Netstream Lync Connect
Nuwave Communications, Inc. NuWave Connect
Masergy Communications Intelligent SIP Trunk
One Source Networks Lync Trunking
OneStream Networks Skype for Business SIP Trunking
Orange Business Services Business Talk (SIP Trunking)
Peerless Network Enterprise SIP Trunking
Phonero Phonero SIP-trunk
PrimeTel PrimeTel SIP Trunk
Pure-IP OneLync SIP Trunks
QSC AG IPfonie extended link
Redwood Technologies SIP Trunk
Red Sky Technologies E911 Anywhere
Rogers Business Solutions Rogers Business Solutions (RBS) SIP Trunking
SBC Europe SIP Trunking for Microsoft Lync (2013)
SoTel Systems, LLC SIP Trunking
Sprint Global SIP Trunking
Swisscom (Switzerland) VoIP Gate
TalkTalk Business TalkTalk Business SIP Trunking
Tata Communications Global SIP Connect
Tele2 Sweden Tele2 Business Trunk
Telappliant talkAssure SIP Trunking for Microsoft Lync
Telavox SIP Trunk
Tele2 VoIP Connect
Telecom New Zealand / Gen-I Voice Connect
Telefonica Business Solutions SIP Trunking
TeliaSonera Finland Oyj Sonera Business Voice Access
Telio Telecom AS Telio SipTrunk
Telkomsel Telkomsel Connect
Telnyx, LLC Telnyx Mission Control Self-Service Portal and API
Telus IP Trunking
Thinktel SIP Trunking
toplink GmbH tpl_sip.business LC
T-Systems International GmbH Corporate SIP Germany
tw telecom Managed SIP Services
UPC Schweiz GmbH Business Voice IP-PBX
Verizon Business IP Trunking Services
Vodafone GmbH IP Anlagen-Anschluss
Vodafone Netherlands Vodafone Office Voice (VoV) and Corporate Net over IP (CNoIP)
Vodafone Next Generation Services Ltd WXC SIPLink
Voxbone SA VoxDID, Vox800
West IP Communications MaxxConnect
Widevoice, LLC SIMPLE LYNC TRUNK
Windstream Communications Dynamic IP
WorldNet WorldNet SIP Trunking
XO Communications XO SIP Services
ZipTel ZIPTELECOM SIP Trunk (TCP IPV4 only)

SIP Trunk Service Qualification Process

The SIP trunk service provider interoperability program qualifies services offered by providers connecting enterprise, on-premise Skype for Business voice networks to a service provider offering PSTN origination, termination and emergency services by making use of the SIP protocol.

If you are a vendor seeking to join the certification program, see How to Join for requirements and available programs.