Non-PRO English to Bulgarian Tech/Engineering

Some networks may choose to provide a service of mapping some or all of the information from the incoming call packet into the SETUP message (see 3.2.3/X.31). Table 6-4 shows the mapping of the X.25 incoming call elements to Q.931 information elements. The incoming call packet will still contain these fields when it is delivered. See 3.2.3/X.31 for mapping requirements.