diff --git a/erpnext/public/js/telephony.js b/erpnext/public/js/telephony.js
index 6cb1207..b66126c 100644
--- a/erpnext/public/js/telephony.js
+++ b/erpnext/public/js/telephony.js
@@ -1,13 +1,16 @@
 frappe.ui.form.ControlData = frappe.ui.form.ControlData.extend( {
 	make_input() {
-		this._super();
+		if (!this.df.read_only) {
+			this._super();
+		}
 		if (this.df.options == 'Phone') {
 			this.setup_phone();
 		}
 	},
 	setup_phone() {
 		if (frappe.phone_call.handler) {
-			this.$wrapper.find('.control-input')
+			let control = this.df.read_only ? '.control-value' : '.control-input';
+			this.$wrapper.find(control)
 				.append(`
 					<span class="phone-btn">
 						<a class="btn-open no-decoration" title="${__('Make a call')}">