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Cisco Bug: CSCuw26259 - SIP SUBSCRIBE msg is responding back with 503 Service Unavailable

Last Modified

Jun 04, 2018

Products (1)

  • Cisco IOS

Known Affected Releases

15.4(3.0j)M2 15.5(2.10)T 15.5(2.20)T

Description (partial)

Symptom:
BLF stops working on SIP IP phones registered to CME after few days.

Conditions:
This happens because we are basically hitting the Max Subscription Acceptance so CME responds back with 503 Service Unavailable. Below error message is seen in the SIP logs

"Maximum accept subscription limit reached"

for 29XX MAX-SUBSCRIPTION-COUNT is 10000
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