call trahsfer при переводе звонка с Cisco на шлюзе AudioCodes MP124

Прошу помощи в настройке оборудования Cisco (FXS и PRI шлюзы на базе маршрутизаторов) и AudioCodes MP124 FXS. Необходимо заставить телефоны подключенные к AudioCodes MP124 FXS реагировать на HookFlash и переводить звонки. Ожидаемый на Сisco signalType "!" при опции dtmf-relay h245-signal получить так и не удалось.

Transfer включен глобально на MP-124?

Настройки в Media Settings, RTP / RTCP и в DTMF & Dialing крутили:

Analog Signal Transport Type

Ignore analog signals [0] = Hook-flash isn’t transferred to the remote
side (default).
RFC 2833 analog signal relay [1] = Hook-flash is transferred via RFC
2833.

Hook-flash Option

Supported hook-flash Transport Type (method by which hook-flash is sent and
received).
You can select:
Not Supported [0] = Hook-flash indication isn’t sent (default).
H.245 User Input [1] = Send H.245 User Input indication message in a basic string.
H.245 Signal Method [2] = Send H.245 User Input indication message in a signal
structure.
Q.931 Info [3] = Sending hook-flash as an exclamation mark (!) in Q.931 Info
message.
RFC 2833 [4] = RFC 2833.
Note: FXO gateways support receiving of RFC 2833 hook-flash signals.