TRANSip Resources

TRANSip in the HDX or the SLICE 2100 consists of:

• TRANSip Software located in the controller board
  • Includes 100 IP Registerant entries per HDX shelf or SLICE 2100 unit
  • Optional blocks of 100 IP registrants can be purchased (up to 1000 subscribers per shelf)
• TRANSip Media Services Circuit (MSC) board for the HDX (equivalent functionality is embedded in SLICE 2100)
  • Includes TRANSip Media Gateway Functionality
  • Optional TRANSip MoIP/FoIP Engines

Resource Planning

Common resources in the HDX and SLICE 2100 consist of:

1) Ports
2) Timeslots
3) IP Registerants

Ports and timeslots are explained in the previous section. 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 1000 IP registrants in each HDX shelf or SLICE 2100 unit. These registrants do not use any ports unless they are active, mean-ing in a call state. These IP registrants only use timeslots if they need to access the voice related services like access to TDM or custom an-nouncements offered by HDX or SLICE 2100.

The timeslots and ports that are used for IP calls are located in the MSC board. Therefore, the number of timeslots and ports that are needed for IP calls should be assigned to 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.

IP 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 oc-cupy 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)

IP 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 as-surance that the device is authorized.

An IP telephone is not connected physically to the HDX or SLICE 2100. Rather, it simply sends a message to the TRANSip's SIP Call Controller requesting to be "registered". Once an IP phone is successfully registered, the TRANSip's SIP Call Controller may dispatch calls to it and ac-cept requests for service from it.

Because the IP phones are not physically connected to the TRANSip's SIP Call Manager, 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 setting the phone to recognize the IPv4 or IPv6 address of the HDX shelf or SLICE 2100 unit and also assigning an optional pre-arranged password. The SIP user of the IP phone and the same pre-arranged password are entered into the TRANSip's IP Registrant table.

Registration validates the existence of the IP phone. When the IP phone is "idle", it is merely known to the TRANSip's SIP Call Manager—it uses no additional resources in the HDX or SLICE 2100.