Briefly and simply about the complex – routing in the “8-800”

Once again I will remind you that in service “8-800” SCP (Service Control Point) processes only routing rules, i.e. “Signal” component of the call. The voice path according to the rules of optimal routing is switched on the shortest route from the switch of subscriber A, which makes a call to the number “8-800” to the subscriber switch B, which receives it.

What are the parameters SCP “8-800” has for deciding on the routing of the call?

First of all, this is actually the numbers A and B involved in the call. For the number A, its regional affiliation and location can be determined if it is a mobile subscriber. Of course, the rule can be built on the analysis of the time of day (for example, working or not working hours) and the day of the week (for example, a weekday or a day off) or a specific date (for example, an extra holiday holiday). From the technological point of view, the number of connecting lines (SL) on number B and their employment can be analyzed. In addition, the reason for the lack of the possibility to establish a connection with the B number can also be analyzed (for example, a free CO or an “accident” on the number has ended, ie the number is not available for some reason). Personal “black” and “white” lists of the user of the “8-800” service can be analyzed, for example, a list of the A (or whole directions) numbers listed in the “black” or, alternatively, in the VIP list (the list of numbers for priority processing) .

(1) “From the technical specification for routing numbers 8-800”.

The routing platform of number 8-800 should ensure call forwarding according to the following rules:

  1. On working days from 9-00 to 18-00 all calls must be forwarded to the number 495 XXX-XX-XX.
  2. During off-hours, calls must be forwarded to:

2.1 Calls from city and mobile numbers in the Moscow region – to number 499 XXX-XX-XX.

2.2 Calls from the city and mobile numbers of the Leningrad region and the city of St. Petersburg – to number 812 XXX-XX-XX.

2.3 Calls from city and mobile numbers of other regions – to number 383 XXX-XX-XX.

  1. In case of unavailability of any of the redirection numbers – all calls are diverted to 4822 XX-XX-XX.


This non-complex version of routing was implemented using standard means – checking the time / date conditions and affiliation of Subscriber A to the region. In addition, the function of checking the availability of the diversion number for making a call was used.

This variant of the routing settings was implemented using the routing function “primary / backup”, placing the target numbers of the CC “cascade” one by one. For the CC of Ekaterinburg, the connection via “Multifon SIP-Trunk” via VPN channel was configured. For each of the CC, its alarm timer (the time during which the service tries to establish a connection with the number) was picked up on the line.

Separately, I will note an important point for potential customers of the “8-800” service. It is necessary to forecast and plan the potential traffic volume, which will go to the number 8-800 and use certain routing settings to exclude the excess of the load on its operators and reduce the risks of exceeding the budget. In the MegaFon service “Free number 8 800”, for example, there is a setting – the number of simultaneous calls that the client is ready to receive at a given time. This parameter is usually set depending on the number of telephone lines and operators ready to receive a call at the moment. The value can be changed, for example, to reduce it to lunch time, during off-hours, etc. This is necessary to ensure that callers to number 8-800 do not “hang” for a long time on the tube in line, but could call or otherwise communicate with the company. Also, with a tight budget, you can set the parameters for the number of calls that the company is ready to accept, per day, week or month.