You can configure Standard Local Survivability (SLS) to enable a local G430 to provide a degree of MGC functionality when no link is available to an external MGC. SLS is configured from the individual G430 itself using the command line interface. SLS is supported for all analog interfaces, ISDN BRI/PRI trunk interfaces, non-ISDN digital DS-1 trunk interfaces (T1 Robbed Bit and E1-CAS), IP phones, IP softphones, and DCP phones.