Howto:IP Austria SIP Provider Compatibility Test

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Innovaphone Compatibility Test Report



IP Austria

  • Features:
    • Direct Dial In
    • DTMF
  • Supported Codecs by the provider
    • G711
    • G729
    • G723

The provider supports all required innovaphone features and is therefore qualified as recommended SIP Provider. The provider does not support T.38, which will result in possible problems when sending faxes from fax machines via this SIP trunk. To circumvent this kind of problems, IP Austria offers a Fax-to-Email solution which can be bought additionally to this SIP trunk. For more information on this issue, please contact IP Austria directly.

The configuration on innovaphone side is simple, since the built-in SIP-GW can be used to connect to the provider.

Starting with innovaphone's v9 firmware the CGPN cannot be suppressed.

IP Austria has achieved 93% of all possible test points. For more information on the test rating, please refer to Test Description

Current test state

Image:Recprod.PNG The tests for this product have been completed and it has been approved as a recommended product (Certification document).

Testing of this product has been finalized March 31, 2010.

Testing Enviroment

Scenario NAT


This scenario describes a setup where the PBX and phones are in a private network. The IP800 must does not use a stun server, the SIP provider is responsible for handling the correct NAT mappings. The IP800 does not works as media relay, all RTP - streams don't pass the PBX.

Test Results

For more information on the test procedure, please read the following wiki article: SIP Interop Test Description. Bold lines in the test results indicate a KO-criteria.

Basic Call

Tested feature Result
call using g711a Yes
call using g711u Yes
call using g723 Yes
call using g729 Yes
Overlapped sending No
early media channel Yes
Fax using T.38 No
Reverse Media Negotiation Yes
CGPN can be suppressed Yes
CLIP no screening No
Long time call possible(>30 min) Yes
External Transfer Yes
NAT Detection Yes
Voice Quality OK? Yes

Direct Dial In

Tested feature Result
Inbound(Provider -> Innovaphone) Yes
Outbound(Innovaphone -> Provider) Yes


Tested feature Result
DTMF tones sent correctly Yes
DTMF tones received correctly Yes


Tested feature Result
Call can be put on hold Yes
Held end hears music on hold / announcement from PBX Yes

Transfer with consultation

Tested feature Result
Call can be transferred Yes
Held end hears music on hold Yes

Transfer with consultation (alerting only)

Tested feature Result
Call can be transferred Yes
Held end hears music on hold or dialling tone Yes
Call returns to transferring device if the third

Endpoint is not available


Blind Transfer

Tested feature Result
Call can be transferred Yes
Held end hears dialling tone Yes

Broadcast Group & Waiting Queue

Tested feature Result
Caller can make a call to a Broadcast Group Yes
Caller can make a call to a Waiting Queue Yes
Announcement if nobody picks up the call Yes


Firmware version

  • v8 Hotfix2 (80542)
  • was retested with v9 final firmware

SIP - Trunk

First of all the SIP Trunk must be configured. Here an example of our IP Austria - Trunk. IP - Austria awaits in the From Header the complete Calling Party Number(CGPN). The default innovaphone setting is to not send the complete CGPN in the FROM - Header, but in the Preferred Identity Header. Change the setting From Header: to CGPN in user part of URI and Identity Header when sending Invite to Fixed AOR.

Image:IP Austria SIP Compatibility Test 1.PNG

Number Mapping

The complicated part on this issue is the correct mapping of the outgoing and incoming numbers.

Image:IP Austria SIP Compatibility Test 2.PNG

Route Settings

Because IP Austria, as most SIP - Providers too, doesn't support overlap sending, you must enable the block-wise sending of the phone number. You can do this by enabling Force enblock in the automatically generated Routes.

The second setting you must check is Interworking(QSIG,SIP). This feature must be enabled to properly relay supplementary services, like Hold over the SIP Trunk. If this check-box is unchecked only basic call Information like connect and disconnect will be forwarded by the Gateway.

Image:IP Austria SIP Compatibility Test 3.PNG

Media Relay

By enabling Media Relay on the PBX, The IP800 will work as an RTP - Proxy, so all RTP Streams will travel through the IP800. This mode poses a much greater load on the PBX, so the number of concurrent calls will be heavy limited. The tests described in this article, were successful without using Media Relay. If you run into problems(media, one way audio), you can still activate the Media Relay check-box at the SIP interface.

Special Scenario: incoming call contains only the trunk number

In Austria it is common procedure that incoming calls to the switchboard ("Zentrale") do not use an extension(e.g. '0'), the dialed number contains only the trunk number. To handle such calls the Incomplete Number attribute of the Trunk Line object must point to a PBX object that should handle the calls (e.g. a waiting queue object).

Image:IP Austria SIP Compatibility Test 4.PNG

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