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analog hookflash from VG224+CME over SIP trunk to CUCM - failed

hello!

I have the office with CUCM 7.1 and 2911 as h323 gateway to PSTN

I have the branch with CME with FXO cards to PSTN - and VG224 with analog phones

CUCM and CME interconnect with SIP trunk.

I can connect any phone from the office (Cisco sccp phone) and any phone from the branch without problem. the direction of call is not important. every direction works fine. and every method - PSTN or SIP trunk - works fine.

BUT.

When I use PSTN connection I can forward a call from one branch analog phone to another branch analog phone using hookflash button.

When I use SIP trunk I cannot forward a call from one branch analog phone to another branch analog phone using hookflash button. Call is desconnecting after I press hookflash button.

Please help me in solving this trouble.

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