E1/T1 to SIP/IAX Trunk

Hello everybody (and happy Holydays!
)
I've read somewhere that is better for load balancing to "convert" E1/T1 lines in SIP or IAX trunks, so they can be accessible from every single asterisk without using, in example, two T1/E1 digium card in a 2 asterisks environment. So I was thinking: does it exist a "gateway", where I can put in all my E1/T1 trunks and I've in output a single SIP or IAX trunk accessible from every * ?
Thank you very much!

I've read somewhere that is better for load balancing to "convert" E1/T1 lines in SIP or IAX trunks, so they can be accessible from every single asterisk without using, in example, two T1/E1 digium card in a 2 asterisks environment. So I was thinking: does it exist a "gateway", where I can put in all my E1/T1 trunks and I've in output a single SIP or IAX trunk accessible from every * ?
Thank you very much!
