SIP error due to MultiTech SIP UDP Overflow

Question

Hi, 
 I'm new in Sophos, we decided to use SIP in our company but the Firewall rejects it. 
 When I checked the logs I saw below errors. Would appreaciate if you can help. 
 Log:

2017-01-09 00:35:47

Signatures

Drop

-

194.49.126.36 :UDP (5060)

10.40.16.149 :UDP (5060)

2100513

MultiTech SIP UDP Overflow

Thanks

sixteen again · Accepted Answer

Try unloading sip helper: 
 from ssh , option 4 "device console": 
 system system_modules sip unload

Aditya Patel · Answer

HI Tuna, 
 Could you check if you have implemented any IPS policy on your Business application rule . Also , did you test using TCP instead of UDP ? There are several advantages by doing so.