diff --git a/src/sms.ts b/src/sms.ts
index 1175580..93f75c7 100644
--- a/src/sms.ts
+++ b/src/sms.ts
@@ -89,9 +89,9 @@ export function createSms(input: SmsInput, handlers: SmsHandlers): Sms {
 		from: input.from,
 		message: input.message,
 		pduObjs: input.pduObjs,
-		sendDlr: status => sendDlr(sms, handlers, status),
+		sendDlr: status => sendDlr(sms, input.session, handlers, status),
 		sendResp: options => (input.answeredAs === undefined
-			? sendResp(sms, answered, options ?? {}, handlers)
+			? sendResp(sms, input.session, answered, options ?? {}, handlers)
 			: answeredOnArrival(options ?? {}, handlers)),
 		session: input.session,
 		get smsId(): string {
@@ -128,6 +128,7 @@ function answeredOnArrival(
 
 async function sendResp(
 	sms: Sms,
+	session: Session,
 	answered: { smsId: string },
 	options: SendRespOptions,
 	handlers: Pick<SmsHandlers, 'lostLink' | 'onAnswered'>,
@@ -149,7 +150,7 @@ async function sendResp(
 		return { err: new Error('The link this message arrived on is gone, so nothing would correlate the response') };
 	}
 
-	const results = await Promise.all(sms.pduObjs.map((pduObj, index) => sms.session.sendReturn(
+	const results = await Promise.all(sms.pduObjs.map((pduObj, index) => session.sendReturn(
 		pduObj,
 		options.status ?? 'ESME_ROK',
 		respIdParams(pduObj.cmdName, segmentId(answered.smsId, index, total)),
@@ -210,10 +211,11 @@ function collectReceipt(sent: Result<{ pduObj: PduObject }>[]): SendDlrResult {
 
 async function sendDlr(
 	sms: Sms,
+	session: Session,
 	handlers: Pick<SmsHandlers, 'send'>,
 	status: MessageState = 'DELIVERED',
 ): Promise<SendDlrResult> {
-	if (!sms.session.bindAllows('deliver_sm')) {
+	if (!session.bindAllows('deliver_sm')) {
 		return {
 			err: new Error('A transmitter-bound session does not carry deliver_sm'),
 			pduObjs: [],
@@ -236,7 +238,7 @@ async function sendDlr(
 				short_message: receiptText(sms, smsId, status),
 				source_addr: sms.to,
 			},
-			...(sms.session.acceptsOptionalParams() ? { tlvs: receiptTlvs(smsId, status) } : {}),
+			...(session.acceptsOptionalParams() ? { tlvs: receiptTlvs(smsId, status) } : {}),
 		});
 	}));
 	return collectReceipt(sent);