NEC SP5008A user manual Advanced Configuration, System setting

3.2 Advanced Configuration

3.2.1 System setting

prack

ROH (FXS only)

Send billing signal (FXS only)

T.38 NoAttribute

FAX redundancy depth

T.38 FAX Type

PRACK is defined in RFC 3262: Reliability of Provisional Responses in SIP. You can accommodate your softswitch (Proxy Server) to Enable or Disable this feature. Receiver-Off-Hook (ROH) Tone

A ROH tone is sent to the subscriber to inform him that his receiver is off-hook.

You can Enable/Disable this option. Polarity Reversal for billing signal, you can enable (Reverse)/Disable the feature.

No attribute (Fax version, BitRate, Buffer, Datagram…) indicated in T.38 Re-Invite with Session Description Protocol (SDP).

You can Enable/Disable this option. Specify the resend times (0~3)for FAX error packet,

Select the FAX Type to use, you can choose the following:

zT.38

zByPass

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