load balancing, how to make specified ip come out from ether1 only?

RouterOS Beginner Basics
1

on a mikrotik I run load balancing and there is a connected telephone exchange.
how can I make the telephone exchange come out from one ether 1 only
how can configure the firewall ..
this is correct ? add action=accept chain=prerouting comment=“” disabled=no dst-address= 192.168.1.123 in-interface=isp1
thank you

2

So you have a PCC network, but there is one LANIP address you want to hardcode to ETHER1??

Best if you also provide full config
/export file=anynameyouwish ( minus router serial number and any public WANIP info )

3

yes …i want my telephone ip take out only from ether1…
i think this line is my solution ..correct?
/ip firewall mangle
add action=mark-routing chain=prerouting comment=“matrix”
new-routing-mark=ether1 passthrough=no port=5060-5070 protocol=tcp
src-address=192.168.10.208