Mar 27, 2026 - For details about updated CVE-2025-53521 (BIG-IP APM vulnerability), refer to K000156741.

Forum Discussion

pgermain_71805's avatar
pgermain_71805
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Apr 08, 2011

iRule to Hunt on SIP 503 Response

Hello,     In the telephony world, if an SBC receives a SIP 503 from one telco provider, it can hunt to the next one.     I have two servers in a pool that is associated with a virtual ser...
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pgermain_71805's avatar
pgermain_71805
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Apr 11, 2011
Apparently, the SIP monitor keepalive uses the OPTIONS method, which doesn't always return a 503 in the same cases where a call from an external caller would. If that could be customized we would be in business.