If there is no voice when dialing out by UCM/GSM, please check that the 5 way audio cabler is connecte between the GSM submodule and the CVM9001 DSP side. see page 2/3 of the UCM/GSM leaflet
The 5 way audio cable is to be connected from J3 5-way connector for voice connectionto J54 (GSM) connector on Comfort II. See the UCM/GSMMLeaflet
Note that the UCM/GSM does not support VoLTE ie Voice over LTE. Check wth the network provider if they use 3G, LTE or VoLTE,.
Try dialing in to the GSM Mobile number of the SIM card. If you hear a recorded message saying you cannot reach the subscriber, that indicates that there is a problem with the provider network - it may be using VoLTE or there may be no money in the SIM card
For instructions on disabling VoLTE using 4G and 5G SIM Cards please see this topic http://www.comfortforums.com/view_topic.php?id=5455&forum_id=48
Last edited on Saturday Nov 18th, 2023 04:04 am by slychiu
I came across the same problem of not having any kind of audio announcement on the GSM line and found out that I do not have this 5-way cable connecting my UCM/GSM board to the Comfort Ultra J54 connector.
What are the specs for this cable and plug type so that I can buy one at a local electronics shop?
Last edited on Tuesday Mar 7th, 2023 09:10 pm by eborges
This is a customised cable assembly. The connector is a 1 row x 5 pins with 2.0 mm pitch, allowing crimping of the wires AWG28. I doubt you will find it in your local electronics store. Show the photo to the shop
Check in the original UCM/gsm box as as the cable should be incluxed. If you cannot find, it we can supply, with transport cost
Last edited on Tuesday Mar 7th, 2023 07:29 am by slychiu