Installation & Maintenance Manual 20. Configuring FXS Ports and PSTN Trunks
Version 6.8 177 Microsoft Lync Server
4. Basic trunk configuration:
a. From the ‘Protocol Type’ drop-down list, select the required trunk protocol.
Notes:
• If the ‘Protocol Type’ field displays 'NONE' (i.e., no protocol type selected) and no
other trunks have been configured, after selecting a PRI protocol type, you must reset
the PSTN Gateway.
• All PRI trunks of the PSTN Gateway must be of the same line type - E1 or T1.
However, different variants of the same line type can be configured on different
trunks, for example, E1 Euro ISDN and E1 CAS (subject to the constraints in the
Release Notes).
• BRI trunks can operate with E1 or T1 trunks.
• If the trunk can’t be stopped because it provides the clock (assuming the PSTN
Gateway is synchronized with the E1/T1 clock), assign a different E1/T1 trunk to
provide the clock or enable ‘TDM Bus PSTN Auto Clock’ in the 'TDM Bus Settings'
page (see Section 20.4 on page 178).
• To delete a previously configured trunk, set the Protocol Type parameter to 'None'.
b. From the ‘Clock Master’ drop-down list, select the trunk's clock source:
♦ Recovered: Clock source is recovered from the trunk
♦ Generated: Clock source is provided by the internal TDM bus clock source
(according to the TDM Bus Clock Source parameter – see Section 20.4 on
page 178)
c. From the ‘Line Code’ drop-down list, select the line code:
♦ B8ZS: (bipolar 8-zero substitution) for T1 trunks only
♦ HDB3: (high-density bipolar 3) for E1 trunks only
♦ AMI: (for E1 and T1)
d. From the ‘Framing Method’ drop-down list, select the required framing method.
For E1 trunks always select Extended Super Frame.
e. To configure whether the trunk connected to the PBX is User or Network side for
QSIG, from the 'ISDN Termination' drop-down list, select User side or Network
side.
5. Continue configuring the trunk according to your requirements.
6. When you have completed configuration, click the Apply Trunk Settings button to
apply the changes to the selected trunk.
7. On the toolbar, click Burn to save the changes to the PSTN gateway flash memory.
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