Re:Direct Transfere between 2 Calls each on a different DN
Calls are coming from a GSM gateway through a sip trunk to the CUCM. The GSM Gateway has 4 SIM cards. Each SIM is configured to route incoming calls to one of 4 DNs. The Operator's Phone has these 4 DNs configured and each has its own CSS that contains a unique partition that has route patterns that add a prefix to the called number and sends it to GSM gateway. The prefix is used for SIM selection on the GSM gateway before it gets stripped.
Now the operator can join 2 calls made on 2 different lines together using the "Join" button. I hope this is useful because I had trouble with it. I opened a case and started this discussion at the same time looking for a quick solution.
And I Got a solution from cisco TAC as mentioned.
On the Old PBX, they had small GSM gateways each with 1 SIM and these gateways had each an FXS port that connect to an FXO on the PBX.
They used to do conference between both calls on the old Analogue phones.
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