
426 Chapter 47 T.38 fax
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5 Verify that the codecs are set at the default before performing T.38 sessions.
To enable a T.38 fax
1 Click Configuration > Telephony Resources.
2 In the Telephony Resources panel, select the row for IP Trunks on Bus 0.
The details panel appears.
3 Click the H323 Media Parameters tab or the SIP Media Parameters tab.
4 Select the Enable T.38 fax check box.
Figure 135 H323 Media Parameters tab
Lines
To enable T.38 fax protocol you must configure the following:
• Voice over IP (VoIP) lines (see “Configuring lines” on page 165)
• target lines (see “Configuring lines: Target lines” on page 183)
• call routing (see “Dialing plan: Routing configurations” on page 283)
• destination codes (see “Destination codes” on page 298)
Media gateways
T.38 UDP redundancy refers to the number of times IP packets (not fax pages) are sent, because
TCP/UDP does not support packet validation (unlike TCP/IP).
To configure media gateways, click Configuration > Resources > Media Gateways.
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