13.6.3  
IP Networking 
 

Functional description  
In IP networking, the HG 1500 connects telephone systems transparently over an IP network. As shown in the following diagram, this connection can be over the Internet - to connect a branch office to a company network, for example - as well as over a private IP network - to link departments in a single location, for example.

 Figure 13-1   Example of IP networking
 
In IP networking, IP connections transparently replace conventional dedicated lines or PSTN dial-up lines between the telephone systems involved. Traffic between these systems can thus be managed cost-effectively via IP connections. In-house connections can use existing IP cables.

Available functions  
The following functions are available for IP networking:
 •   Central attendant console
    A specific system terminal (subscriber) can be configured as an attendant or intercept position. Any incoming call to the system will arrive here automatically if no subscriber can be assigned to it, although the call may originally have come in on any one of the nodes connected via IP networking.
    The central attendant console can then forward these calls to the required subscriber. Again it does not matter which node the station is logged on to.
    Once the attendant queue reaches a predefined length, calls can be automatically forwarded to an overflow destination.
    Cross-node busy signaling is available when using optiClient Attendant.
 •   Virtual ports
    Virtual ports are used for the signaling of statuses and calls on all systems. They are not linked to physical terminal interfaces. The corresponding boards must not be inserted. Virtual ports have their own internal and external phone numbers and can therefore be called. They can be programmed for signaling on DSS keys and be added to call pickup groups.
 •   DISA Internal (Direct Inward System Access Internal)
    When using Internal DISA Intern (not to be confused with External DISA Extern) certain features in a node can be activated by stations of a different node:
   •  Release of the door opener using the relay option
   •  Follow me
   •  Relay on/off
   •  Night service
   •  Disconnecting from a hunt group/group call
 •   System Speed Dialing
    A redundant central speed-dial directory is maintained from which the local speed-dial directories of all nodes is updated. This means that IP telephones connected to the HG 1500 have access to the speed-dials as TDM phones.
 •   CO Call Privileges and Toll Restriction
    The call privileges configured per node is transferred via CorNet-N in converted format. Permitted and denied lists of a station can only be evaluated in the node in which the station is configured. The dial plan can be used to specify where the toll restriction is to be executed. Please note that in this process all allowed numbers and denied numbers lists are mapped to "Can access local public network". This in turn is mapped to denied numbers list 1 in a subsequent node. Consequently, it is possible that in a subsequent node a toll restriction with denied numbers list 1 will be set up again or added.
 •   Least Cost Routing (LCR)
    LCR is possible via both the trunk connections and the IP connections. The dial plans of each node can be configured individually. If so configured, "Fallback to SCN" function can be used to forward a call automatically to an SCN connection if the IP connection fails.
    When an external call is forwarded to another node (transit break-in), the caller's number is converted automatically to the international format.
    The seizures codes used to date are replaced by port numbers. This type of configuration is better suited for a LAN environment.
 •   Music on Hold (MOH)
    In a HiPath server node, a PCM/IOM channel can be permanently connected to MOH. This channel is permanently connected to a DSP channel that forwards MOH unidirectionally to one or more IP clients or other HG 1500 boards. MOH for IP clients always requires only one DSP channel. (Normal clients cannot benefit from this; for MOH, they require an additional a PCM/IOM and a DSP channel respectively.)
    The channel for MOH is automatically assigned by the system.
 •   Direct Station Select (DSS) and Busy Lamp Field (BLF)
    The DSS functionality - signaling of call-processing station states - is available to all terminals in the system, also to those on different nodes. This provides a system-wide call pickup solution, and is completely transparent to the terminal user programming the DSS keys.
 •   SIP-Q
    From HiPath 3000/5000 V7 or later, networking via SIP-Q V2 with HiPath 2000/HiPath OpenOffice EE, HiPath 3000, HiPath 4000, HiPath 5000 and OpenScape Voice is possible.
   
In HiPath 3000 V8 and HiPath 4000 V5 and later systems, only SIP-Q V2 protocol is used for IP networking between these systems and only CorNet-NQ is used for TDM networking. CorNet-IP protocol is no longer supported.  

HiPath 3000/5000 V9, Service Documentation, Issue 7   up Top
Disclaimer & Copyright   ID: P31003H3590S100017620   2012-06-25