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s300 and CUCM dual mode interface

Hey All

s300 operates in dual port mode. Phones are connected to the LAN port, CUCM is on the network behind the WAN. The SIP Trunk is up. An interesting situation is observed. A call from phone A (connected to s300) to phone B (connected to CUCM) goes through normally. A call from phone B (CUCM) to phone A (s300) also goes well, but after phone A hangs up, the user of phone B hears the message from CUCM: The dialed number cannot be connected, check the number and retry the call

s50 with similar settings, but in the mode one interface (LAN) does not have such a problem

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