I am a CISCO Voice Engineer currently working for a CISCO Partner. I have more than 5 years of experience in Voip projects deployment in middle and large size companies, like Banks, ISP-s, Call Centers etc. PLagi
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You have to check with your SIP provider if that DUD can work as sip trunk with Cisco device.
They have support can help us building that trunk if it is doable.
Note, you have to add Cisco in project sLagi