How to configure U1900 series Simultaneous Ringing service?
64U1900 series configuration,please refer to the product documentation: http://support.huawei.com/ehedex/hdx.do?docid=DOC1000073913 "Configuration>Feature Guide>Voice Service>Simultaneous Ringing" part.
The numbers in U1900 unified Gateway and and out office numbers can also configure with homologous:
efer to the product documentation: "Configuration>Feature Guide>Voice Service>Simultaneous Ringing " part. While configuration, set the number with sign-out prefiex+inter-office number.