Several days ago i've finally implemented new Telephony System based on CUCM. But some times we have a strange issue: When operator try to transfer call to remote destination (remote office, phone in this office is registered to CUCM) from PSTN, PSTN caller and remote phone can't hear each other, after they were connected by operator. Or even when remote phone tries to make outbound call to PSTN
Here is simple topology
Where can be the problem? Can you help please?
Remote offices and Central office are connected betwenn by IPSEC tunnel on ASA 5505 or D-LINK DFL-260E. I've disabled traffis inspection of sip, skinny and h323 on all edge devices.
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