Howto:Toplink SIP Provider Compatibility Test

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Innovaphone Compatibility Test Report



SIP Provider: Toplink

The provider supports all required innovaphone features and is therefore qualified as recommended SIP Provider.

Currently Toplink does not support the transport of DTMF tones via SIP - Info messages. As a result, Media-Relay must be activated on the SIP trunk if Mobility is used in the PBX.

That being said, Toplink has achieved 95% of all possible test points. For more information on the test rating, please refer to Test Description

  • Features:
    • Direct Dial In
    • Fax over IP (T.38)
    • DTMF
  • Supported Codecs by the provider
    • G711
    • G729
    • G723
    • T.38 UDP

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 November 5th, 2012.

Testing Enviroment

Scenario NAT


This scenario describes a setup where the PBX and phones are in a private network. The IP800 doesn't use an stun server. The IP800 doesn't work as media relay, Media-Relay is needed only for the transport of DTMF-Info SIP - messages(see test on DTMF).

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
call using g722 No
Overlapped sending No
early media channel Yes
Fax using T.38 Yes
CGPN can be suppressed Yes
Clip no screening Yes
Long time call possible(>30 min) Yes
External Transfer Yes
NAT Detection Yes
Redundancy Yes, see subtopic Redundancy
SIP over TCP No
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 sent correctly via SIP-Info Yes, requires mediarelay
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, requires disabling of SIP interworking to provider

Transfer with consultation

Tested feature Result
Call can be transferred Yes
Held end hears music on hold Yes, requires disabling of SIP interworking to provider

Transfer with consultation (alerting only)

Tested feature Result
Call can be transferred Yes
Held end hears music on hold or dialling tone Yes, requires disabling of SIP interworking to provider
Call returns to transferring device if the third

Endpoint is not available


Blind Transfer

Tested feature Result
Call can be transferred Yes, only for G711A
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


No information from the provider was received yet. However tests showed that it is possible to register two SIP - interfaces using the same account. Calls will be then send via the last registered account, if this registration is down the previously registered SIP - Interface is used.


Firmware version

All innovaphone devices use V9 HF15 as firmware.

SIP - Trunk

First of all the SIP Trunk must be configured. Here an example of our Toplink - Trunk. If you want that the Gateway should act as Medialrelay, you must activate the option Media-Relay. This is needed if the 'Mobility feature is required in the PBX - setup.

Image:Toplink SIP Compatibility Test 1.PNG

Number Mapping

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

Image:Toplink SIP Compatibility Test 2.PNG

Route Settings

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

Image:Toplink SIP Compatibility Test 3.PNG


The FAX was connected via a BRI(TEL1)-interface to the IP800. When configuring the BRI-interface you must keep in mind that the T.38 codec must be enabled.

Image:Toplink SIP Compatibility Test 4.PNG

Now the PBX and the phones are setup correctly. You should be able to make call in both directions and send and receive fax messages.

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