diff --git a/livekit/attrs.go b/livekit/attrs.go
index 613d8e6e..2102d8b8 100644
--- a/livekit/attrs.go
+++ b/livekit/attrs.go
@@ -3,17 +3,17 @@ package livekit
 // Names of participant attributes for SIP.
 const (
 	// AttrSIPPrefix is shared for all SIP attributes.
-	AttrSIPPrefix = "lk.sip."
+	AttrSIPPrefix = "sip."
 	// AttrSIPCallID attribute contains LiveKit SIP call ID.
 	AttrSIPCallID = AttrSIPPrefix + "callID"
 	// AttrSIPTrunkID attribute contains LiveKit SIP Trunk ID used for the call.
 	AttrSIPTrunkID = AttrSIPPrefix + "trunkID"
 	// AttrSIPDispatchRuleID attribute contains LiveKit SIP DispatchRule ID used for the inbound call.
 	AttrSIPDispatchRuleID = AttrSIPPrefix + "ruleID"
-	// AttrSIPFromNumber attribute contains number from which the call was made.
+	// AttrSIPTrunkNumber attribute contains number associate with LiveKit SIP Trunk.
 	// This attribute will be omitted if HidePhoneNumber is set.
-	AttrSIPFromNumber = AttrSIPPrefix + "fromNumber"
-	// AttrSIPToNumber attribute contains number to which the call was made.
+	AttrSIPTrunkNumber = AttrSIPPrefix + "trunkPhoneNumber"
+	// AttrSIPPhoneNumber attribute contains number external to LiveKit SIP (caller for inbound and called number for outbound).
 	// This attribute will be omitted if HidePhoneNumber is set.
-	AttrSIPToNumber = AttrSIPPrefix + "toNumber"
+	AttrSIPPhoneNumber = AttrSIPPrefix + "phoneNumber"
 )
diff --git a/rpc/sip.go b/rpc/sip.go
index 83be131b..4e0a2832 100644
--- a/rpc/sip.go
+++ b/rpc/sip.go
@@ -24,8 +24,8 @@ func NewCreateSIPParticipantRequest(
 	}
 	attrs[livekit.AttrSIPTrunkID] = trunkID
 	if !req.HidePhoneNumber {
-		attrs[livekit.AttrSIPToNumber] = req.SipCallTo
-		attrs[livekit.AttrSIPFromNumber] = trunk.OutboundNumber
+		attrs[livekit.AttrSIPPhoneNumber] = req.SipCallTo
+		attrs[livekit.AttrSIPTrunkNumber] = trunk.OutboundNumber
 	}
 	return &InternalCreateSIPParticipantRequest{
 		SipCallId:             callID,
diff --git a/rpc/sip_test.go b/rpc/sip_test.go
index 07ad712d..832176b4 100644
--- a/rpc/sip_test.go
+++ b/rpc/sip_test.go
@@ -43,11 +43,11 @@ func TestNewCreateSIPParticipantRequest(t *testing.T) {
 		Dtmf:                "1234#",
 		PlayRingtone:        true,
 		ParticipantAttributes: map[string]string{
-			"extra":                   "1",
-			livekit.AttrSIPCallID:     "call-id",
-			livekit.AttrSIPTrunkID:    "trunk",
-			livekit.AttrSIPFromNumber: "+1111",
-			livekit.AttrSIPToNumber:   "+3333",
+			"extra":                    "1",
+			livekit.AttrSIPCallID:      "call-id",
+			livekit.AttrSIPTrunkID:     "trunk",
+			livekit.AttrSIPTrunkNumber: "+1111",
+			livekit.AttrSIPPhoneNumber: "+3333",
 		},
 	}, res)
 
diff --git a/sip/sip.go b/sip/sip.go
index 34cea4da..e27c2f53 100644
--- a/sip/sip.go
+++ b/sip/sip.go
@@ -412,8 +412,8 @@ func EvaluateDispatchRule(trunkID string, rule *livekit.SIPDispatchRuleInfo, req
 		from = from[len(from)-n:]
 		fromName = "Phone " + from
 	} else {
-		attrs[livekit.AttrSIPFromNumber] = req.CallingNumber
-		attrs[livekit.AttrSIPToNumber] = req.CalledNumber
+		attrs[livekit.AttrSIPPhoneNumber] = req.CallingNumber
+		attrs[livekit.AttrSIPTrunkNumber] = req.CalledNumber
 	}
 
 	room, rulePin, err := GetPinAndRoom(rule)
diff --git a/sip/sip_test.go b/sip/sip_test.go
index 2783dff8..4e10fc2e 100644
--- a/sip/sip_test.go
+++ b/sip/sip_test.go
@@ -552,8 +552,8 @@ func TestEvaluateDispatchRule(t *testing.T) {
 			livekit.AttrSIPCallID:         "call-id",
 			livekit.AttrSIPTrunkID:        "trunk",
 			livekit.AttrSIPDispatchRuleID: "rule",
-			livekit.AttrSIPFromNumber:     "+11112222",
-			livekit.AttrSIPToNumber:       "+3333",
+			livekit.AttrSIPPhoneNumber:    "+11112222",
+			livekit.AttrSIPTrunkNumber:    "+3333",
 		},
 	}, res)