Voice over IP

A connection of ixi-UMS via IP can be realized by means of ixi-UMS VoIPconnect via H.323 or SIP. The ixi-UMS Server hereby can initiate calls via a gateway or a gatekeeper / proxy. Requirements for the connection via VoIP in order to guarantee the functionality of the single services of ixi-UMS:

Fax:		Voice:
Variant 1: T.38		RTP/RTCP with the Codecs G.711 ALaw or µLaw
Variant 2: "SoftFax" / "Fax pass trough" with		SMS via fixed lines:
RTP/RTCP with Codec G711 ALaw or µLaw, Clearchannel (no echo cancellation, no VAD, no ComfortNoise, etc.)		RTP/RTCP with Codec G711 ALaw or µLaw, Clearchannel (no echo cancellation, no VAD, no ComfortNoise, etc.)

Call number transfer to the ixi-UMS Server

For the operation of an UMS server, the transmission of the recipient's phone number and the sender's phone number are relevant for incoming calls. The numbers are canonized by the <% IXI-UMS%> server into an ITU-T E.164 (International Numbering Plan) number in the international notation according to E.123

·	Recipient number

The ixi-UMS recipient number should be transferred to the ixi-UMS Server as extension/MSN. The ixi-UMS Server completes this to an E.123-standard number. In special cases, it may be desired that the numbers in international format be transferred from/to the telephone system. In this case, ixi-UMS Kernel needs a special configuration.

·	Sender number

With the use of H.323, the sender number information of the "NumberingPlan" (NP) and "TypeOfNumber" (ToN) sent to ixi-UMS from the PBX must be consistent with the format of the number itself.

Example:

A UMS-message is received at the site in Munich from the sender number +49 89 123456. The transfer from the PBX / NTBA to ixi-UMS e.g. can be transferred via one of the following "information pairs" (NP/ToN):

NP ( NumberingPlan)	ToN (TypeOfNumber)	Transferred Number
unknown	unknown/ISDN-E.164	089123456
ISDN - E.164	unknown/ISDN-E.164	089123456
ISDN - E.164	unknown/ISDN-E.164	12345
ISDN - E.164	national	8912345
ISDN - E.164	subscriber	12345
ISDN - E.164	international	498912345

When a number NP or (and) ToN "Unknown" is signaled by the PBX or the outside line, the internal number conversion rules of the ixi-UMS Kernel are activated. If ""Remove outside line access" is selected, for example, the ixi-UMS Kernel can remove this. In every other case, these rules do not apply.

In the SIP-protocol, the fields "NP/ToN" do not exist. The call number format always is "unknown".

With the use of SIP, the ixi-UMS Kernel must be set up in dependence of the transferred call numbers. Recommended is the transfer of the recipient number as "extension" (DDI/MSN) and the sender number as national (089 598741) or international (0039 1 6554788), this means always with prefix.

·	Redirecting and Redirection Number

When the ixi-UMS Voice-Mail Server with the inbound routing option "Route-by-Redirection" shall be used, this must be transferred to ixi-UMS as:

with SIP: SIP Diversion Header

with H.323: H.450.3

Deployment ixi-UMS Voice-Mail Server and / or ixi-UMS Auto Attendant

When the features transfer / connect and/or callback shall be used, the following features must be supported in addition:

with SIP:

Standard SIP "INVITE" and "REFERE"

with H.323:

H.450.2 "Call Transfer supplementary service for H.323."

and

H.450.4 "Call Hold supplementary service"

Required for redirect of calls (ixi-UMS Voice-Mail Server) and transfer to other extensions by the ixi-UMS Auto Attendant.

Additional information:

The service HOLD is needed to hold an active call in order to make the call transfer after having made a consultation call.

Retrieve is needed when the consultation call or the call transfer was not successful in order to reactivate the held call.

For more detailed information about the connection / configuration of the ixi-UMS VoIPconnect for your PBX, please turn to ixi-UMS support department.

Version ixi-UMS_Enterprise_6.70