how to add third caller to call when using an ATA adapter?

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We are using the Cisco SPA-122 ATA adapter for our conference room (Polycom soundstation 2). 
Sometimes during a call we will be asked to conference another number to the call, like a cell phone. on our true IP phones like cisco SPA 525g2 this is not an issue but since our conference room phone is a regular analog phone using an ATA adapter we don't have those CONF buttons. so the question is, how do we do this? I would assume it be something like press *+code+phone number + *  +code or something weird like that. 
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Juan Villicana

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Posted 8 months ago

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Saadet, Employee

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Hey Juan, 

Right now the Cisco ATA does not support the conferencing capability. However, we will be adding a new Polycom ATA that will support this.
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Juan Villicana

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Hi, thank you for the response. are you sure? the data sheet has this "Three-way conference calling with local mixing"
https://www.cisco.com/c/en/us/products/collateral/unified-communications/small-business-voice-gateways-ata/datasheet_C78-691107.html
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Saadet, Employee

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Hey Jaun, that functionality isn't available with our service via the Cisco ATA.