A connection of ixi-UMS Business via IP can be realized via H.323 or SIP. The ixi-UMS Business 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 Business:
·Call number transfer to the ixi-UMS Business Server
For the operation of a server-based Unified Messaging Systems, the transfer of the recipient number and the sender number are relevant. With inbound calls, the call numbers are canonized by the ixi-UMS Business Server into a number in the international E.123 format according to ITU-T E.164 (international numbering plan).
In special cases, it may make sense to transfer the recipient number in international format. If so, this funktion must be aktivated in the ixi-UMS Business Server.
The ixi-UMS Business recipient number should be transferred to the ixi-UMS Business Server as extension/MSN. The ixi-UMS Business Server completes this to an E.123-standard number.
With the use of H.323, the sender number information of the "NumberingPlan" (NP) and "TypeOfNumber" (ToN) sent to ixi-UMS Business from the PBX must be consistent with the format of the number itself.
A ixi-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 Business e.g. can be transferred via one of the following "information pairs" (NP/ToN):
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 Business 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 Business with the inbound routing option global "voice-mailbox number" (Route-by-Redirection) shall be used, this must be transferred to ixi-UMS Business as:
§with SIP: SIP Diversion Header
§with H.323: H.450.3
·Call transfehr and callback with ixi-UMS Business
When the features transfer and/or callback shall be used, the following features must be supported in addition:
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.