14.3.2.3.1. SIP Service Provider 
Native SIP trunking is mainly used for connections to SIP service
providers.
IMPORTANT:
For a connection to a non-released SIP service
provider a change request has to be written!
The SIP providers and SIP trunking partners released in the OpenScape
4000 are listed in the OpenScape 4000 Release Notes. They will be updated
with every new minor or fix release.
For more information please refer to Chapter
5, “Configuration of SIP Service Provider / SIP Carrier”.