Use this tab to configure advanced fax protocol.

T.38 outbound mode: Select one of the following options to define how to switch to T.38 mode during outbound calls.

• 10: Switch to T.38 without G.711 pass-through support

• 20:Try T.38 with a fallback to G.711 pass-through

• 40: Use G.711 pass-through unless T.38 is requested by the remote side (default)

• 60: Use G.711 pass-through and prevent switching to T.38 mode

T.38 inbound mode: Select one of the following options to define how to switch to T.38 mode during inbound calls.

• 10: Switch to T.38 without G.711 pass-through support

• 20: Try T.38 with a fallback to G.711 pass-through

• 40: Use G.711 pass-through unless T.38 is requested by the remote side (default)

• 60: Use G.711 pass-through and prevent switching to T.38 mode

Enable V.34: Select to enable support for V.34 fax (high-speed fax), and support for T.38 version 3, which is required for V.34 operation.

Enable ECM reception: Select to enable T.30 Error Correction Mode (ECM) for incoming messages.

Bearer capability: Q.931 bearer capability for outgoing calls (0 - Speech, 16 - 3.1 KHz Audio).

Protocol redundancy: T.38 low-speed redundancy (0..3)

Data redundancy: T.38 high-speed redundancy (0..3)