Collaboration with VoIP Providers

VoIP Providers

Collaboration with VoIP Providers (also known as ITSP) via SIP Trunking is an important topic in the todays world of IP Voice/Data Communication. The following information will give an overview of the supported VoIP Providers in the different countries as well as additional considerations and hints regarding 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
SIP trunking with single numbers (MSN) and up to 30 SIP user accounts (called Internet telephony stations in WBM)
Direct Inward Dialing (DID)
most important features available
- CLIP
- Hold, Consultation, Toggle
- Transfer (attended, semi-attended)
- Ringing group, Call pickup
- Conference
- Call Forwarding
- DTMF transmission e.g. for voicemail access
large number of simultaneous VoIP connections depending on 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 (or G.711)

Security Warning - Malicious attacks from the Internet may lead to reduced service quality or toll fraud!
Please strictly follow these basic rules:

Never open up the firewall in an internal or external router e.g. by forwarding port 5060.
The SME platforms take care of opening the firewall for traffic with the selected VoIP providers. Attacks from other internet addresses are therefore blocked. Opening up the router's firewall would invalidate this security measure.
Never configure SIP subscribers at a HiPath / OpenScape system without a strong password.
Authentication blocks registration of unauthorised SIP clients. See SIP Endpoint Configuration

The SME platforms with SIP Stack 4.0.26 have been validated with the BroadWorks SIP Interface. BroadWorks is the Carrier VoIP solution from Broadsoft, the global market leader. The tested SIP Stack is used in the current system versions Hipath 3000 V8 and OpenScape Office V3 as well.

Broadsoft Validation
Broadsoft Partner Configuration Guide (see configuration guides for the current systems below)

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. One common STUN setting must be used for all providers in a system.

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 most providers. These connections must be implemented via S0 access (administration default)
Only one external destination is allowed for ringing groups which are to be called via SIP trunk from VoIP provider.
DTMF is supported via RFC 2833 or inband. SIP INFO method is not supported.
For Fax transmission the T.38 protocol is highly recommended. Fax pass through using codec G.711 has been found much less reliable in most SIP provider environments. If your provider does not yet support Fax T.38, Fax pass through with G.711 is possible but there is no warranty or further support.
Other media types besides audio (voice and voice band data) and image (fax) are not supported.
The ITSP has to support outband DTMF (RFC2833) for using the OpenScape Office Autoattendant via SIP trunk.

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.

First the VOIP / SIP trunking providers, which are most important for your business, are selected and agreed with product management.
Next step is to get the IP and SIP settings necessary for interworking with the specific provider. The document "VoIP Provider Configuration" has to be completed and sent to the VoIP Provider cerification team to allow correct initial PBX setup.
After that, the VoIP provider test list has to be worked through in the country, according to the instructions included. Remote support is available by the VoIP Provider cerification team. The tests cover the most important features at the SIP trunking interface. Leading switch should be the OpenScape Office MX, after that a reduced delta test list can be used for HiPath 3000.

VOIP provider test list and configuration last update: 2011-03-23

The final test results including traces and provider data shall be delivered to the VoIP Provider cerification team.
The appropriate VoIP provider configuration data will be included in the HiPath / OpenScape Office administration for easy setup.
After successful tests the VoIP provider is released, and published on this page. Back level support is available for the new provider after that.

General Information by platform

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

HiPath 3000

Valid for HiPath 3000 ≥ V7 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.
No FAX via ITSP from/to OpenScape Office HX client applications. A TDM trunk has to be used.
SIP trunking is not released for use with the OpenScape Office HX Contact center application.

Configuration

HiPath 3000 Configuration Guide for Internet Telephony:

HiPath 3000 Config Guide ITSP

OpenScape Office LX/MX

Valid for OpenScape Office V2 (MX) and V3 (LX/MX):

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 cannot 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 application. Fax via G.711 is not supported with the application. No Fax over IP is available for the OpenScape Office V2 application, a TDM Trunk has to be used.
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.
Release of SIP trunks for use with the OpenScape Office Contact Center application is under preparation for OpenScape Office V3.

Configuration

OpenScape Office Configuration Guide for Internet Telephony:

OpenScape Office Config Guide 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
COLT	DID
Skype Connect	MSN

Please check provider home page for supported countries.
Skype Connect (former name Skype for SIP) 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
Engin	MSN
Internode	MSN

Austria

VoIP Providers	Type	OpenScape Office
UPC / inode	MSN	-
IP-austria	DID
WNT	DID	-

Belgium

VoIP Providers	Type	OpenScape Office
Belgacom	DID
Hexacom	MSN DID	-
Telenet	MSN DID

Brazil

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

Czech Republic

VoIP Providers	Type	HiPath 3000	OpenScape Office
T-mobile	MSN DID
Telefonica O2	MSN DID

Chile

VoIP Providers	Type	HiPath 3000	OpenScape Office
Entel NGN	MSN		-

Finland

VoIP Providers	Type	HiPath 3000	OpenScape Office
Elisa	DID		-

France

VoIP Providers	Type	HiPath 3000	OpenScape Office
OpenIP	DID	-
Optimitel	DID		-

Germany

VoIP Providers	Type	OpenScape Office
1&1	MSN	-
Vodafone (formerly Arcor)	VoIP Anlagenanschluss (DID)
freenet (now 1&1)	MSN	-
freenetBusiness (discontinued)	DID
GMX (now 1&1)	MSN	-
Purtel	MSN	-
QSC	IPfonie extended (DID)
sipgate	sipgate basic (MSN) sipgate trunking (DID)
toplink	MSN DID
XSip (discontinued)	DID	-

Italy

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

Mexico

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

The Netherlands

VoIP Providers	Type	HiPath 3000	OpenScape Office
I2Connect	MSN DID		-
Infopact	MSN DID		-
OneCentral	MSN DID
Priority Telecom	MSN
Tele2	MSN DID	-	1) 1)

1) Only for OpenScape Office MX. The WAN interface with PPPoE has to be used, no operation behind an external router is supported.

Portugal

VoIP Providers	Type	HiPath 3000	OpenScape Office
Portugal Telecom	DID

Slovenia

VoIP Providers	Type	HiPath 3000
Amis	MSN
Detel	MSN
MegaM	MSN
tustelekom	DID
T-2	DID	-
UPC Telemach	MSN

South Africa

VoIP Providers	Type	HiPath 3000	OpenScape Office
Telfree	MSN DID	-
Vodacom	MSN DID

Spain

VoIP Providers	Type	HiPath 3000	OpenScape Office
vozelia	MSN DID		-
Xtra Telecom	MSN

Sweden

VoIP Providers	Type	HiPath 3000	OpenScape Office
Tele2	DID
Telia	MSN

Switzerland

VoIP Providers	Type	HiPath 3000
Cablecom	DID
sipcall	MSN	-
SofiCall	MSN	-
vtx	DID

United Kingdom

VoIP Providers	Type	HiPath 3000	OpenScape Office
Gamma	DID
Opal	DID
Voiceflex	DID

United States of America

VoIP Providers	Type	HiPath 3000	OpenScape Office
Cbeyond	MSN		-
Sotel	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.

Released SIP Providers in Detail

The table provided here shows the ITSP providers that were successfully checked in a connectivity test. More details about test results are given in the pdf-file Overview of released SIP providers below. Informations concerning CLIP, CLIR, COLP etc. are listed, restrictions may be reported as well.

Overview of released SIP providers Latest update: 2011-04-12

Connectivity Test Information

The connectivity test is carried out with

HiPath 3000
OpenScape Office MX/LX

Tests are done for MSN- and DID-account (as long as the provider´s realm is different), also the platforms are checked as NAT router and / or behind a router.

Several test scenarios are clustered in the test list, main issues are:

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

The connectivity tests are performed using the following endpoints:

Analogue
ISDN
HFA-phones
UP0 phones
SIP-phones
AP 1120 HFA / SIP
optiClient 130 HFA
WLAN2-phones HFA / SIP

At least 3 different types of phones are used for each test case.

Frequently asked Questions

VoIP Provider FAQ - answers to frequently asked questions

External Links

Siemens Enterprise Business Area (SEBA) (login required, Internet Explorer only)
VoIP Anbieter (Übersicht, Feature, Vergleiche)

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