TRANSip Resources Resource Planning IP User Registration

TRANSip Resources

TRANSip consists of:

  • TRANSip software located in the controller board
    • IP trunking capability
    • Subscriber Registrar
      Optional blocks of 100 IP registrants can be purchased (up to 3000 subscribers per shelf)
  • TRANSip Media Services Circuit (MSC) board for the HDX
    Equivalent functionality is embedded in SLICE 2100 and SLICE IP
    • TRANSip Media Gateway Functionality and optional T.38 / V.150.1 engines for fax and modem relay
    • Conferencing
    • Announcements
    • Call Progress Tones

Resource Planning

Common resources in the HDX and SLICE 2100 consist of:

1) Ports
2) Timeslots
3) IP Registrants

There are 1000 ports in the HDX and SLICE 2100. There are 512 timeslots in each HDX shelf and SLICE 2100 unit. The amount of timeslots per HDX shelf in a system with more than 8 shelves will change based on the total number of shelves.

There are up to 3000 IP registrants in each HDX shelf or SLICE IP and up to 2000 in a SLICE 2100 unit. These registrants do not use any ports unless they are active, meaning in a call state. These IP registrants only use timeslots if they need to access the voice related services such as access to TDM or custom announcements offered by HDX or SLICE 2100.

The timeslots and ports that are used for IP calls are located in the MSC board. One MSC board can have up to 128 timeslots. Additional boards should be added to the system if more timeslots (i.e. IP to TDM conversions) are needed.

Below are two examples to further clarify the shared resources in the HDX and SLICE 2100.

techview-ip-to-ip.pngIP to IP Call

In this example, an IP phone calls another IP phone using HDX as the call controller. These phones are registered in the HDX, thus they occupy 2 of the possible 1000 entries in this HDX shelf. They do not occupy any port until they call each other. The moment they call each other, each of them occupies a port on the MSC board. However, since there is no IP to TDM conversion, no timeslots are used.

Total resources used in this example:

  • Ports = 2 (on the MSC Board during the call)
  • Timeslots = 0 (no TDM connection)
  • IP Registrants = 2 (each IP phone is registered to the HDX)

techview-ip-to-tdm.pngIP to TDM Call

In this example, an IP phone calls an analog phone using TRANSip HDX as the call controller and media gateway. The IP phone is registered to TRANSip and occupies 1 of the possible 1000 entries in the HDX shelf. The moment the IP phone calls the analog phone or vice versa, a timeslot is used in the MSC board for media gateway functionality.

The total resources used in this example:

  • Ports = 2 (1 port on the MSC board and 1 port for the analog line)
  • Timeslots = 2 (1 timeslot on the MSC board and 1 timeslot on the analog line)
  • IP Registrant = 1 (only 1 IP phone is registered to the HDX)

The resource planning might be complicated due to the number of variants. At REDCOM, we will be more than happy to help with resource planning if our customers have any questions or concerns.

IP User Registration

TDM circuit-switched phones and other TDM equipment are physically connected to the HDX or SLICE 2100. This gives some physical assurance that the device is authorized.

An IP telephone is not connected physically to a TRANSip-equipped system. Rather, it uses the data network to send a SIP message to the system to be “registered”. Because IP phones are not physically connected to the TRANSip’s SIP Call Controller, it must ensure the IP phone is, indeed, an authorized device, and not one that is masquerading for the purpose of unauthorized use of TRANSip’s services. This is accomplished by programming the phone with the IPv4 or IPv6 address of the TRANSip equipped system, specifying a SIP username, and assigning an optional pre-arranged password. The SIP username and password are exchanged and validated as part of the registration process. Registration typically occurs when the phone is powered up, and then is repeated at scheduled intervals.

Once an IP phone is successfully registered, TRANSip’s SIP Call Controller may dispatch calls to it and accept requests for service from it. When the IP phone is “idle”, as long as the registration has not expired, TRANSip remains aware of the phone, but it does not occupy any ports or timeslots on the system.

 
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