Welltech VoIP ATA series V.303 - Manual (Page 64)

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9.3 Advanced
9.3.1 Function
Provide [SIP Expire Time, SIP/RTP Port, QoS, Register SIP Expire Time, Use DNS SRV,
DTMF, User=Phone, PRACK] Function.
9.3.2 Instruction
Figure 1: 1FXS(ATA171plus, ATA-171), 1FXS+1PSTN(ATA-171P),
1FXS+1FXO(ATA-171M).
(Figure 1)