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When call is made with JavaScript API, an additional parameters can be passed to control bandwith via SDP, for exampleoutgoing calls (to INVITE request)

var sdpAttributes = ["b=AS:3000","b=TIAS:2500000","b=RS:1000","b=RR:3000"];
var outCall = session.createCall({
        sipSDP: sdpAttributes,
        ...
    });

and incoming calls (to 200 OK response)

        var sdpAttributes = ["b=AS:3000","b=TIAS:2500000","b=RS:1000","b=RR:3000"];
var outCall = session.createCall		inCall.answer({
            sipSDP: sdpAttributes,
            ...
        });

Those parameters will be added to SDP after connection information ("c=IN IP4 <WCS IP>") and before time description ("t=0 0") to INVITE request (for outgoing calls) and 200 OK response (for incoming calls):

v=0
o=Flashphoner 0 1541068898263 IN IP4 192.168.1.5
s=Flashphoner/1.0
c=IN IP4 192.168.1.5
b=AS:3000
b=TIAS:2500000
b=RS:1000
b=RR:3000
t=0 0
m=audio

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