diff --git a/pkg/config/config.go b/pkg/config/config.go
index 8e2dc354..c86b8a5c 100644
--- a/pkg/config/config.go
+++ b/pkg/config/config.go
@@ -80,6 +80,7 @@ type Config struct {
 	NAT1To1IP     string `yaml:"nat_1_to_1_ip"`
 	ListenIP      string `yaml:"listen_ip"`
 
+	UDPMaxPayload int `yaml:"udp_max_payload"`
 	// if different from signaling IP
 	MediaUseExternalIP bool   `yaml:"media_use_external_ip"`
 	MediaNAT1To1IP     string `yaml:"media_nat_1_to_1_ip"`
diff --git a/pkg/sip/service.go b/pkg/sip/service.go
index 09ff5575..bab8fe8a 100644
--- a/pkg/sip/service.go
+++ b/pkg/sip/service.go
@@ -29,6 +29,8 @@ import (
 	"sync/atomic"
 	"time"
 
+	"github.com/livekit/sipgo/transport"
+
 	"google.golang.org/protobuf/types/known/emptypb"
 
 	msdk "github.com/livekit/media-sdk"
@@ -73,6 +75,9 @@ func NewService(region string, conf *config.Config, mon *stats.Monitor, log logg
 	if log == nil {
 		log = logger.GetLogger()
 	}
+	if conf.UDPMaxPayload > 0 {
+		transport.UDPMTUSize = conf.UDPMaxPayload
+	}
 	if conf.MediaTimeout <= 0 {
 		conf.MediaTimeout = defaultMediaTimeout
 	}