Howto:Config size Limitations

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Sometimes, in large scenarios, there are configurations that can exceed some limits. This is to be considered in a concept planning.
In most cases, problems with the limitations are simple conceptual errors and can be resolved by a different configuration.

If you have any problems with the concept development, or problems with understanding, please feel free to contact our presales team

Whole Configuration File

  • the total length of each line must not exceed the following size:
  • 32kB in V13r1 and higher
  • 20kB in V12r1, V12r2
  •   8kB in v11r2 and lower
  • the number of whitespace separated strings (words) on each config line must not exceed 1024

Gateway layer

  • the total size of "config change" commands must not exceed 29kB


  • No more than 32 alias entries are allowed on one Gatekeeper/Registrar interface.


  • Amount of 64kB flash segments to store VARS in the configuration.
    • 2 segments on Gateways
    • 10 segments on IPVA

PBX Object

  • Maximum Hardware IDs on a PBX Object:
  • 10 in V13r1 and higher
  •   6 in V12r2 and lower
  • No more than 32 conditions (only/only not) in a single CFx are possible
If more conditions are needed, we recommend moving the logic to an external XML script that interprets the CGPN and forwards the call if necessary. See sample scripts
  • Maximum size of a single xml attribute:
  • 32kB in V13r1 and higher
  •   4kB in V12r2 and lower
  • User specific myApps homescreen configuration: 8KB

PBX Groups

  • Maximum limitation is 2048 Objects in a group
  • Maximum limitation for the primary group in a Waiting Queue Object is 30 bytes for the groupname

Reverse Proxy

  • As of version 13r2 sr15, you can configure 128 maps per hostname entry. Previously, only 32 maps were allowed.

Weak Scenarios and better Solutions

Many Routes and Number Mappings in the routing engine

It is not recommended to create very large configurations in the routing engine. Instead, we recommend an assessment of the necessary concept and a sustainable solution.



  • Online Calculator of bytes on String -
    • please consider: A single character can use 1 to 4 bytes. It depends on the character. (Eg. the most chars use 1 byte, german umlauts use 2 bytes)

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