Howto:Deltacom SIP Provider Compatibility Test

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SIP Provider: Deltacom

The provider has achieved 79,17% of all possible test points (95 on total of 120 Points). For more information on the test rating, please refer to Test Description

  • Features:
    • Direct Dial In
    • DTMF
    • Redundancy Mechanism

  • Supported Codecs by the provider
    • G711 a/u
    • G729

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 in August, 2012.

Testing Enviroment

Scenario NAT


This scenario describes a setup where the PBX and phones are in a private network. The IP800 should use a stun server, in order to send correct SIP - messages. Media-relay on IP800 SIP Trunk Interface to provider is also required, all RTP-streams go through 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 X
Call using g729 Yes
Call using g722 X
Overlapped sending X
Early media channel Yes
Fax using T.38 X
CGPN can be suppressed X
CLIP no screening X
Reverse Media Negotiation X(Media-relay necessary)
Long time call possible Yes
External Transfer Yes
NAT Detection X
Voice Quality OK? Yes
Redundancy Mechanism 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
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 Yes

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

All innovaphone devices use V9hf15 as firmware.

SIP - Trunk

Here's the configuration of the SIP gateway interface.


Deltacom 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 Preffered Identity Header. Change the setting From Header: to CGPN in user part of URI.

Number Mapping


Route Settings

Deltacom, as most SIP Providers do, doesn't support overlap sending. You must enable the enblock sending of the phone number. You can do this by enabling Force enblock in the appropriate outgoing Route.

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.



Redundancy is supported by configuring a dedicated GW interface on STAND-BY device. Provider allows up to 3 concurrent interfaces configured for a single account. Incoming calls will be sent parallel on both MASTER and STAND-BY but will be answered only by the MASTER when up.

Known Issues

CGPN for outgoing calls cannot be suppressed as the provider only allows calls from the assigned number range.

We were not able to have T38 work correctly with this provider, however there were no problems sending and receiving faxes without it.

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