Sorry, the ip address needs to be in quotes. oid("1.3.6.1.4.1.1768.100.70.10.2.1.2.1", 10, 5, "81.28.86.107") It works, thanks! one more thing, when the value of the "SIP_TOTAL" is 0, i`m getting that the probe is down.. i`m using: available: SIP_TOTAL() > 0 Error: if(...