Question on T.38 bandwidth

Hi All,

H.323 Annex D (D.6) <quote> When TCP is used for T.38 fax transmission, maxBitRate in the ARQ/BRQ does not include the fax data rate, and if a voice link is switched off when the fax session starts, a BRQ shall be used to indicate to the Gatekeeper that the bandwidth has changed. When UDP is used for T.38 fax transmission, maxBitRate in the ARQ/BRQ does include the bit rate needed for the fax session. The endpoint (terminal, gateway) shall send BRQs to the Gatekeeper as bandwidth needs change during the call. </quote>

Is there any specific reason why we do not include the fax data rate in the requested bandwidth for TCP? If TCP is the transport protocol, what will be the bandwidth value that is requested in ARQ/BRQ?

rgds Faisal