The waiting time for what?  What time do you want to extend?

The waiting time for answer is 2 minutes (120 seconds) and can not be adjusted. This timer is an industry standard which is high enough to play long announcements (where answer supervision is not returned), but short enough to prevent fraud.

So there is no field in a table or office parameter where this can be adjusted.

Hey I may be talking nonsense as we have no R2 trunks in our network. But a quick look in Helmsman showed a couple of office parms that look like they may be relevant.

TABLE OFCENG;POS R2_AN_WAIT_FOR_ANSWER

Parameter name
     R2 Analog Wait For Answer

Functional description
     A switching unit with R2 analog signaling requires this parameter. This
     parameter specifies the length of time that a trunk waits for an answer signal
     after the trunk receives all of the address digits.

Rules in provisioning
     Specify the length of time that a trunk waits for an answer signal after the trunk
     receives all of the address digits. The value of this parameter appears in
     seconds.

Range information
     Minimum Maximum Default
           0   32767     300

OR


TABLE OFCENG;POS R2DIG_WAIT_FOR_ANSWER

Parameter name
     R2 Digital Wait For Answer

Functional description
     A switching unit with R2 digital signaling requires this parameter. This
     parameter specifies the length of time that a trunk waits for an answer after this
     trunk receives all of the address digits.

Rules in provisioning
     Specify the length of time that a trunk waits for answer after this trunk receives
     all of the address digits. The value of this parameter appears in seconds.

Range information
     Minimum Maximum Default
           0   32767     300