Can I use 2 server ip in 1 ip softphone?

I use X-Lite it can set 1 sip account . If I have 2 server . Can I set only 1 ip and call to 2 server ?

The first server can call to the second one on behalf of the original caller, or the first server can issue a SIP redirect to the second server. Asterisk can do either, but, being a limited capability loss leader, I 'm not sure that X-Lite could authenticate to the second server if you used a redirect.