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The connection of communication systems to the public network via SIP Trunking can be used instead of or in addition to traditional PSTN trunks. Many VoIP Providers, also known as ITSPs, are offering corresponding services. The following article gives an overview of the SIP trunking features and limitations and lists the Providers, which have been tested and released with the SME platforms.

You did not find your provider? Find out how to get it released!

Overview

The SME platforms have been tested with a large number of Internet telephony providers that support SIP. Continuously new providers are tested, released and included within administration. As the SIP recommendations leave some room for interpretation, there are differences in the range of features supported with a specific provider. In this chapter general information is given which is valid for all platforms and all SIP Providers.

SIP trunking features for all SME platforms

• Up to 4 active SIP providers and one Internet connection
• Operation behind another router using STUN (can be configured per provider with current software) - integrated SBC functionality
• SIP trunking with single numbers (MSN) and up to 30 SIP user accounts (called Internet telephony stations in WBM)
• Direct Inward Dialing (DID)
• Comprehensive feature set available e.g.
  • CLIP
  • Hold, Consultation, Toggle
  • Transfer (attended, semi-attended)
  • Ringing group, Call pickup
  • Conference
  • Call Forwarding
  • DTMF transmission e.g. for voicemail access
• Simultaneous VoIP connections depending on system and available DSL bandwidth, used Codec and system. G.711 needs up to 92 kbit/s, G.729A needs up to 36 kbit/s in both directions.
• Automatic fallback to ISDN at SIP trunk failure
• Voice Codecs G.711 and G.729
• Fax over IP via T.38

General Requirements for VoIP

• LAN with 10/100/1000 MBit/s and no more than 40% network load
• Separate port on the switch or router for every component in the IP network (no hubs as concentrators)
• Not more than 50 ms delay in one direction (One Way Delay); not more than 150 ms total delay
• Not more than 3% packet loss and 20 ms jitter
• Quality of Service (QoS) support - IEEE 802.p, DiffServ (RFC 2474) or ToS (RFC 791)
• Sufficient WAN bandwidth (uplink and downlink) for intended simultaneous calls and CODEC
• External modem, such as a DSL modem
• Intermediate routers shall support quality of service and bandwidth control mechanisms if the WAN link is used for voice and data simultaneously. SIP messages have to be routed transparently.

For interworking with different network configurations and edge devices and how to use STUN please see Network Configuration for VoIP Providers.

Restrictions for all Providers and SME Platforms

• Special call numbers and emergency calls
  • Special call numbers (e.g. 0800, 0900, 0137) or analog fax/modem connections are not supported by all SIP providers.
  • Emergency call numbers (e.g. 110, 112) are not supported by many providers. These connections must be implemented via TDM trunks.
• For DTMF transmission outband transport via RFC 2833/RFC4733 is highly recommended. The ITSP MUST support outband DTMF (RFC2833) if UC Suite functions via SIP trunk (e.g. auto attendant, voicemail control) shall be used.
• For DTMF transmission inband transport may be used, but the functionality cannot be guaranteed as local (e.g. low cost HFA) or remote endpoints (e.g. UC-Suite) may not support inband DTMF.
• For Fax transmission the T.38 protocol is highly recommended. The ITSP MUST support T.38 if UC Suite fax via SIP trunk shall be used.
• If your provider does not support Fax T.38, Fax pass-through with G.711 is possible but there is no warranty or further support from UNIFY.
• CLIP no screening (set a different number to be displayed at called party) is not available with HiPath 3000 and OpenScape Office. It is available in OpenScape Business from V1R3 with ITSPs in DID mode. More details in "OSBiz V1 Configuration for ITSP".
• In a network, a configured ITSP can be used at each respective node. From OpenScape Business V1R3 only one centralized ITSP in a network can be used.
• An incoming ITSP call can be transferred or forwarded to another public subscriber via ITSP. Concatenation of such 'trombone scenarios' is not supported. So 2 lines (one incoming and one outgoing) are used while the call is active.

How to get a new VoIP provider released

Tests are necessary with every new provider before making installations in the field due to different implementations of the SIP protocol. Otherwise no support is available for an ITSP. Test resources have to be provided by the region or partner.

1. Select the VOIP / SIP trunking providers, which are most important for your business, estimate business relevance and get agreement for start of certification from product management.
2. Get the IP and SIP settings for the specific provider. Send the completed document "VoIP Provider Data Collection" to the VoIP Provider certification team. This is essential for correct PBX setup. The tables in chapter 2 have to be filled in.
     VOIP provider data collection and test list - last update: 2014-10-11
3. Perform all tests in the VoIP provider test list from above, according to the instructions included. System configuration and tests require trained local personal. Remote support is available by the VoIP Provider certification team.
4. Deliver the test results, including all Wireshark traces and final provider data to the VoIP Provider certification team.

After successful tests the VoIP provider is released, and published on this page. Regular back level support is available for issues with the new provider after that. A preconfigured VoIP provider profile will be included in the HiPath / OpenScape Office / OpenScape Business administration for easy setup.

General Information by platform

For discontinued platforms see Collaboration with VoIP Providers (discontinued platforms).

OpenScape Business

New certifications will be based on OpenScape Business in future. 

• For common features and restrictions see overview
• Concurrent calls via ITSP (depending on the available bandwidth and used Codec).
  • 60 for OpenScape Business X3 / X5 / X8
  • 128 for OpenScape Business S
• An external router is always necessary for OpenScape Business S, OpenScape Business X3 / X5 / X8 can optionally be operated with the bulit-in router / firewall.
• Mobility Entry with DTMF call control is supported for OpenScape Business X3 / X5 / X8, but not for OpenScape Business S.
• FAX over IP with T.38 is supported for analog Fax devices, terminal adapters and the OpenScape Business UC Suite. Fax G.711 is not supported via the UC Suite. The fax functionality UC Suite only supports the transmission T.38 standard. Prerequisite for the correct fax transmission is a connection via an ISDN gateway or an ITSP that supports T.38.
• A trunk prefix to select a SIP trunk as an alternate trunk can be used from the OpenScape Business client's dial box but not from client's directories and settings (myPortal, myAttendant, myAgent).
• SIP trunks cannot be used for presence based call forwarding, if a TDM trunk is also present because of the limitation above.

Configuration

OpenScape Business Configuration Guide for Internet Telephony:

•   OSBiz V1 Configuration for ITSP- last update: 2014-06-16
•   OpenScape Business Config Guide CLIP- last update: 2014-06-16

HiPath 3000

Valid for HiPath 3000 V9 with HG 1500.

SIP Trunking features

• For common features and restrictions see overview
• An external router is always necessary
• Maximum 32 concurrent calls between IP phones and ITSP (depending on the available bandwidth and used Codec). For TDM devices (analog, ISDN) 1 B-channel at HG 1500 has to be available for each concurrent call (gateway call).
• SIP trunks can not be used for dialing through or direct inward system access with DTMF tones e.g for the feature Mobility Entry. Please use a TDM line for those features.
• For OpenScape Office HX related features Fax via application, trunk prefix use and presence based forwarding see below.

Configuration

HiPath 3000 Configuration Guide for Internet Telephony:

•   HiPath 3000 Config Guide ITSP

See also:

• How to configure CLIP sent via SIP trunk / ITSP

OpenScape Office

Valid for OpenScape Office V3 LX / MX / HX.

SIP Trunking features

• All features, requirements and restrictions listed in overview are valid.
• Up to 32 simultaneous calls via SIP trunking for OpenScape Office MX (depending on available DSL bandwidth and used Codec)
• Up to 128 simultaneous calls via SIP trunking for OpenScape Office LX (depending on available DSL bandwidth and used Codec)
• An external router is always necessary for OpenScape Office LX, OpenScape Office MX can optionally be operated with the bulit-in router / firewall.
• SIP trunks can not be used for dialing through or direct inward system access with DTMF tones e.g. for the feature Mobility Entry. Please use a TDM line for those features. Starting from OpenScape Office V3, myPortal for Mobile supports comprehensive control and UC functionality.
• FAX over IP with T.38 is supported for analog Fax devices, terminal adapters and the OpenScape Office UC Suite application. Fax via G.711 is not supported with the UC Suite application. The fax functionality UC Suite only supports the transmission T.38 standard. Prerequisite for the correct fax transmission is a connection via an ISDN gateway or an ITSP that supports T.38.
• A trunk prefix to select a SIP trunk as an alternate trunk can be used from the OpenScape Office client's dial box but not from client's directories and settings (myPortal, myAttendant, myAgent).
• SIP trunks cannot be used for presence based call forwarding, if a TDM trunk is also present because of the limitation above.

Configuration

OpenScape Office Configuration Guide for Internet Telephony:

•   OpenScape Office Config Guide ITSP

See also:

• How to enter SIP Provider Account Data
  
• How to configure CLIP sent via SIP trunk / ITSP

Tested VoIP Providers by Countries

The main SIP trunking functions of the SME platforms have been tested with the following Internet telephony providers. For detailed information see the document Released SIP Providers below.

= has been successfully tested by development or customer
DID = accounts for PBX-trunking / Direct Inward Dialling
MSN = accounts for single number(s)

International

VoIP Providers	Type	HiPath 3000	OpenScape Office	OpenScape Business
COLT	DID
Verizon	MSN / DID	AppNote Hipath_3000_V9 with_Verizon_IP_Trunks ML 08272013 V03	-	AppNote OpenScape_Business_V1 with_Verizon_IP_Trunks ML 10052013 V05
Skype Connect   3)	MSN

• Please check provider home page for supported countries.
  
• Skype Connect is a fee-based business service from Skype. It allows voice communication between Skype clients and office phones using the standard SIP trunking interface. Other Skype client features like chat or video are currently not supported.

Our SME Platforms have been officially certified by Skype.   Skype Connect with SME platforms

Australia

VoIP Providers	Type	HiPath 3000	OpenScape Office	OpenScape Business
Engin	MSN
Internode	MSN
Commander Primus	MSN / DID	-

Austria

VoIP Providers	Type	HiPath 3000	OpenScape Office	OpenScape Business
UPC / inode   3)	MSN		-
IP Austria / my Tweak   3)	DID

Belgium

VoIP Providers	Type	HiPath 3000	OpenScape Office	OpenScape Business
Belgacom   3)	DID
Belgacom IMS   3)	MSN / DID		*)
Destiny	MSN / DID
Hexacom   3)	MSN / DID
Telenet	MSN / DID
WIN   3)	MSN / DID		*)

 *) Platform released, OpenScape Office application test pending

Brazil

VoIP Providers	Type	HiPath 3000	OpenScape Office	OpenScape Business
CTBC   1)	DID		-
GVT   1)	DID
Voitel	MSN	-

Czech Republic

VoIP Providers	Type	HiPath 3000	OpenScape Office	OpenScape Business
GTS	DID
T-mobile	MSN / DID
O2	MSN / DID

Chile

VoIP Providers	Type	HiPath 3000	OpenScape Office	OpenScape Business
Entel NGN	MSN		-

Denmark

VoIP Providers	Type	HiPath 3000	OpenScape Office	OpenScape Business
Uni-tel A/S	MSN / DID

Finland

VoIP Providers	Type	HiPath 3000	OpenScape Office	OpenScape Business
Elisa	DID		FAX via UC-Suite Application is not released
Länsilinkki	MSN	-
Telia-Sonera	DID
TDC	MSN / DID

France

VoIP Providers	Type	HiPath 3000	OpenScape Office	OpenScape Business
Acropolis Telecom   3)	DID	-
MyStream   3)	MSN / DID	-
OpenIP   3)	DID	-
Paritel Operateur	MSN / DID
Completel	DID	-
Hexatel	DID	-

Germany

VoIP Providers	Type	HiPath 3000	OpenScape Office	OpenScape Business
1&1   3)	MSN		-
Vodafone (formerly Arcor)   3)	VoIP Anlagenanschluss (DID)
ennit AG(formerly tng)	DID / MSN
GMX (now 1&1)   3)	MSN		-
Purtel   3)	MSN		-
QSC	IPfonie extended (DID)
QSC	IPfonie extended Connect (DID)	-	-
sipgate   3)	sipgate basic (MSN) sipgate trunking (DID)
toplink   3)	MSN / DID
Deutsche Telekom   3)	Call&Surf IP (MSN)	-	-
ecotel sipTrunk DDI	DID

Italy

VoIP Providers	Type	HiPath 3000	OpenScape Office	OpenScape Business
Infracom (ex Multilink)   3)	MSN		-
TWT	MSN / DID	-
Viatek	MSN / DID

Mexico

VoIP Providers	Type	HiPath 3000	OpenScape Office	OpenScape Business
Telefonica Mexico   1)	MSN	-

The Netherlands

VoIP Providers	Type	HiPath 3000	OpenScape Office	OpenScape Business
Infopact   3)	MSN / DID
OneCentral   3)	MSN / DID
OneXS	MSN / DID
Priority Telecom   3)	MSN
RoutIT	DID
Speakup   3)	MSN / DID
Tele2	MSN / DID
Vodafone NL	MSN / DID
Voiceworks   3)	DID
Ziggo	DID

New Zealand

VoIP Providers	Type	HiPath 3000	OpenScape Office	OpenScape Business
TelstraClear   3)	MSN / DID
ORCON	MSN / DID

Portugal

VoIP Providers	Type	HiPath 3000	OpenScape Office	OpenScape Business
Portugal Telecom	DID

Slovakia

VoIP Providers	Type	HiPath 3000	OpenScape Office	OpenScape Business
Slovak Telekom   3)	DID

Slovenia

VoIP Providers	Type	HiPath 3000	OpenScape Office	OpenScape Business
Amis   3)	MSN
Detel   3)	MSN
MegaM   3)	MSN
tustelekom   3)	DID
T-2   3)	DID	-
Telemach   3)	MSN

South Africa

VoIP Providers	Type	HiPath 3000	OpenScape Office	OpenScape Business
Nashua NCN	MSN / DID
Telfree   3)	MSN / DID	-
Vodacom	MSN / DID

Spain

VoIP Providers	Type	HiPath 3000	OpenScape Office	OpenScape Business
LCR (Least Cost Routing)	MSN / DID
vozelia   3)	MSN / DID		-
Xtra Telecom   3)	MSN

Sweden

VoIP Providers	Type	HiPath 3000	OpenScape Office	OpenScape Business
Tele2   3), 4)	DID
Telia   3),	MSN

Switzerland

VoIP Providers	Type	HiPath 3000	OpenScape Office	OpenScape Business
Cablecom	DID
sipcall	MSN	-
SofiCall   3)	MSN	-
vtx   3)	DID

United Kingdom

VoIP Providers	Type	HiPath 3000	OpenScape Office	OpenScape Business
BT IPVS	MSN / DID
Gamma   3)	DID
HIPCOM	MSN / DID
Opal   3)	DID
Voiceflex   3)	DID
VoIP Ltd i-Line   3)	MSN / DID	-
tIPicall   3)	DID	-

United States of America

VoIP Providers	Type	HiPath 3000	OpenScape Office	OpenScape Business
AT&T	DID	-	OSO_ATT SipTrk Configuration Note 07092013 V1
Cbeyond   3)	MSN		-
CenturyLink   2)	DID		-
Sotel   3)	MSN / DID
Windstream   3) (Broadsoft platform only)	MSN / DID
XO   1)	MSN / DID	-

1) Access parameters depend on the region within the country. If no default provider profile is supplied within administration, please use "create profile" for configuration.
2) No fixed servers (manual config needed), two profiles with different server addresses and identical accounts and MSN shall be used.

3) ITSP does not support Fax T.38 Standard. Fax communication with UC Suite application is not possible via this ITSP. Prerequisite for the correct fax transmission is a connection via an ISDN gateway or another ITSP that supports T.38.

4) ITSP is certified for SIP-MEX functionality in OpenScape Business only. (from V1R3)

Released SIP Providers in Detail

The table above shows the ITSPs that passed successfully a connectivity test. More details about test results, supported features and restrictions for a specific ITSP are listed in following PDF document.

•   Overview of released SIP providers Latest update: 2014-10-07

The following scenarios are covered within the connectivity test:

• Registration
• Basic Calls from / to ITSP
• Feature Tests
  • Consultation, transfer, toggle, conference
  • Call Pickup / ringing group scenarios
  • call forwarding scenarios
  • DTMF
  • CLIP / CLIR
  • COLP / COLR
  • FAX
• Special Tests
  • emergency calls
  • service calls
  • long duration calls
• Calls handled via UC application

The connectivity tests are performed using various endpoints (for details see test list).

Frequently asked Questions

• VoIP Provider FAQ - answers to frequently asked questions

External Links

• Partner Portal (login required, Internet Explorer only)
•   VoIP Anbieter (Übersicht, Feature, Vergleiche)