How to set IP-Range as "Source" in a multipath-rule ?

Question

Hello Professionals, 
 I have about 20 SIP IP phones in my network and use several Internet lines. i would like to route all sip-traffic via a specific interface. 
 For this I would like to create a multipath-rule, which directs all traffic over the interface "telekom". 
 So I want to make sure my telephony works solid. (I have a DSL interface and a LTE / 4G interface. -->Sip-traffic should be routed via the DSL interface.) 
 
 Why can only 'one' host and no group or IP range, be added to the multipath-rule?

TomP · Answer

hi Dirk, 
 thanks for your help. 
 yes indeed, the network group did not allow me to add an IP-Range Object:

but network-group was the right option for me. 
 The problem ist solved, by adding every IP as a host object, and adding them to the network-group. (the clone option helped me, but it was still a lot of work/clicking.) 
 It works like that, thanks again!!