Rafael RodríguezRafael Rodríguez 

Do newer DAHDI versions include the drivers for old or outdated cards?

Let me elaborate: Say there is an old or outdated, digium-compliant PCI-E card (lspci on CLI throws me Digium Comm) that should be working with a given dahdi version. If I installed the current (ie, most recent release) available DAHDI, should I be able to use the card just the same? Or must I stick to the old version? If I must stick with the old version, could there be problems using recent Asterisk releases with an old dahdi? Is there a way to downgrade my current dahdi?
Best Answer chosen by Rafael Rodríguez
DenisDenis (Sangoma) 
DAHDI still contains the drivers for old or updated cards, therefore you should be able to use it. This being said, please note that our Eng efforts to maintain the driver stop when the card reaches End of Life.  This means that an old driver has an small chance to create problems.

As regards of downgrade, you can downgrade the version of DAHDI, but you will required to recompile Asterisk, this option is not recommended as you may not be ale to install old version of DAHDI on new operating systems
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