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CUCM7+third party SIP phones - call transfer

I have a problem with third party phone Interbell IP250 registered to CUCM7. I cannot make a call transfer when calling from Interbell to Interbell (after pushing transfer button subsequent pushed number buttons "are sent" as DTMF in RTP). When I am calling from Cisco SIP IP phone to Interbell, it is working - I can make a call transfer to other phone from Interbell.

Is it possible to solve it? Call Forward All (CFA) activation from Interbell IP phone is not working, too. I can activate it only in CUCM for Interbell IP phone.

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