Administrator’s Guide for SIP-T2 Series/T19(P) E2/T4 Series/CP860 IP Phones
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3) Enter the desired interval in the Proxy Fallback Interval field.
6. Click Confirm to accept the change.
To configure the interval for re-register when registration fails via web user interface:
1. Click Account->Advanced.
2. Enter the desired interval in the SIP Registration Retry Timer(0~1800s) field.
3. Click Confirm to accept the change.