Open to correction and my information may be dated,
but I used to work for a vendor company that used to make remote access head-end equipment for telcos for DSL, Cable and dial up access. Basically the euipment you connect to when your connecting to the internet
In most cases, the idea of link aggregation or bonding (or with dial up called MLPP- Multilink PPP) required all the calls, and connections to terminate on the one device and the device/ISP had to support it.
The device has to know the two channels belong to the same session and needs to know either to round robin data to the combined pipe or load balance data between the two.
Im not sure a lot has changed since then, but again , adding your two wan connections together used to require a lot more complexity and support from the carrier side the just bonding two ethernet connections as described
here
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