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20.4. Service Information Previous topic Parent topic Child topic Next topic

The following T.38-related features are provided with OpenScape 4000 SoftGate:
  • Codec switching on the fly
  • The Mediatrix AP 41xx, as well as SIP providers, switch from G.729 to G.711 codec without signaling. Therefore, payload-based switching on the fly on the receiving side is supported.
  • Jitter buffer improvements
  • With HiPath 4000 V6 a greater buffer is provided for T.38 transmissions. The buffer size will be switched during a pause (idle) in the media stream.
  • Usage of RFC2833 for fax
  • Albeit discouraged, RFC2833 for fax tones is still supported. However, it is disabled by default. After a software update, the previously configured value will be preserved.
    IMPORTANT:
    With some scenarios, the use of RFC2833 for fax tones may cause problems, so it must be disabled. This is the case with the following configurations: - A Mediatrix 41xx adapter is connected to a hardware gateway, and a AP1120 Cornet IP Adapter is used in the same system. If a DMC shall be established between both adapters, RFC2833 for fax must be disabled. - A SIP service provider which does not support RFC2833 for fax is connected to a hardware gateway.
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