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Call Hold on Hicom 300 ETSI PRI

Call Hold on Hicom 300 ETSI PRI

Call Hold on Hicom 300 ETSI PRI

we are currently integrating an IVR machine over an ETSI E1 trunk connected to an Hicom 300 which should support the ETSI supp services (the protocol has ben set to ETSI).
But when the IVR sends a Call Hold message the Hicom replies with 'message type not existent/not supported' that sounds strange. Does anyone know if the Hicom support the Call Hold over base access only or if it can be a configuration or release dependant problem?
The signalling trace below.

call reference = 00 01 flag = 1
00100100 message type = HOLD board 00 nai 00 group 00

call reference = 00 01 flag = 0
01111101 message type = STATUS board 00 nai 00 group 00 <--
inviato dall'HICOM all'IVR
00001000 IE cause
00000011 length = 0x03
octet 3
1------- extension bit
-00----- coding standard = CCITT
---0---- spare bits = spare bits
----0000 location = user
octet 4
1------- extension bit
-1100001 cause = message type not existent/implemented
octet 5
diagnostic(s) = 24
00010100 IE call state
00000001 length = 0x01
octet 3
00------ coding standard = CCITT
--001010 call state value = active

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