diff --git a/assembler.go b/assembler.go
index 4bd1ab3..c54a3c8 100644
--- a/assembler.go
+++ b/assembler.go
@@ -5,7 +5,6 @@ package wrpssp
 
 import (
 	"context"
-	"errors"
 	"io"
 	"strings"
 	"sync"
@@ -13,10 +12,6 @@ import (
 	"github.com/xmidt-org/wrp-go/v3"
 )
 
-var (
-	errNotHandled = errors.New("not handled")
-)
-
 // Assembler is a struct that reads from a stream of WRP messages and assembles
 // them into a single stream.
 //
@@ -114,7 +109,7 @@ func (a *Assembler) close() {
 // The context is not used, but is required by the wrp.Processor interface.
 func (a *Assembler) ProcessWRP(_ context.Context, msg wrp.Message) error {
 	if !isSSP(&msg) {
-		return errNotHandled
+		return wrp.ErrNotHandled
 	}
 
 	h, err := get(&msg)
@@ -150,3 +145,17 @@ func (a *Assembler) ProcessWRP(_ context.Context, msg wrp.Message) error {
 
 	return nil
 }
+
+// GetStreamID returns the stream ID of the message if it is an SSP message.
+func GetStreamID(msg wrp.Message) (string, error) {
+	if !isSSP(&msg) {
+		return "", wrp.ErrNotHandled
+	}
+
+	h, err := get(&msg)
+	if err != nil {
+		return "", err
+	}
+
+	return h.id, nil
+}
diff --git a/assembler_test.go b/assembler_test.go
index 462b224..cdd2fb0 100644
--- a/assembler_test.go
+++ b/assembler_test.go
@@ -5,6 +5,8 @@ package wrpssp
 
 import (
 	"context"
+	"errors"
+	"fmt"
 	"io"
 	"testing"
 
@@ -157,7 +159,7 @@ func TestAssembler_ProcessWRP(t *testing.T) {
 				Payload: []byte("Hello"),
 			},
 			expected: map[uint64]block{},
-			err:      errNotHandled,
+			err:      wrp.ErrNotHandled,
 		}, {
 			name: "no message number",
 			assembler: &Assembler{
@@ -280,3 +282,64 @@ func TestAssembler_ProcessWRP(t *testing.T) {
 		})
 	}
 }
+
+func TestGetStreamID(t *testing.T) {
+	someErr := fmt.Errorf("some error")
+	tests := []struct {
+		name    string
+		msg     wrp.Message
+		wantID  string
+		wantErr error
+	}{
+		{
+			name: "Valid SSP Message",
+			msg: wrp.Message{
+				Type: wrp.SimpleEventMessageType,
+				Headers: []string{
+					"stream-id:Test-Stream-Id",
+					"stream-packet-number:0",
+				},
+			},
+			wantID: "Test-Stream-Id",
+		}, {
+			name: "Non-SSP Message",
+			msg: wrp.Message{
+				Type: wrp.SimpleRequestResponseMessageType,
+			},
+			wantErr: wrp.ErrNotHandled,
+		}, {
+			name: "A SSP message without the stream-pack-number",
+			msg: wrp.Message{
+				Type: wrp.SimpleEventMessageType,
+				Headers: []string{
+					"stream-id:Test-Stream-Id",
+				},
+			},
+			wantErr: someErr,
+		}, {
+			name: "SSP Message Without Stream ID",
+			msg: wrp.Message{
+				Type: wrp.SimpleEventMessageType,
+			},
+			wantErr: wrp.ErrNotHandled,
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			gotID, err := GetStreamID(tt.msg)
+
+			if tt.wantErr != nil {
+				assert.Error(t, err)
+				if !errors.Is(tt.wantErr, someErr) {
+					assert.ErrorIs(t, err, tt.wantErr)
+				}
+				assert.Empty(t, gotID)
+				return
+			}
+
+			assert.NoError(t, err)
+			assert.Equal(t, tt.wantID, gotID)
+		})
+	}
+}
diff --git a/go.mod b/go.mod
index 84ac4d3..2278828 100644
--- a/go.mod
+++ b/go.mod
@@ -3,8 +3,8 @@ module github.com/xmidt-org/wrpssp
 go 1.23.1
 
 require (
-	github.com/stretchr/testify v1.9.0
-	github.com/xmidt-org/wrp-go/v3 v3.6.0
+	github.com/stretchr/testify v1.10.0
+	github.com/xmidt-org/wrp-go/v3 v3.7.0
 )
 
 require (
diff --git a/go.sum b/go.sum
index 290a982..9e9776f 100644
--- a/go.sum
+++ b/go.sum
@@ -4,12 +4,12 @@ github.com/google/uuid v1.6.0 h1:NIvaJDMOsjHA8n1jAhLSgzrAzy1Hgr+hNrb57e+94F0=
 github.com/google/uuid v1.6.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
-github.com/stretchr/testify v1.9.0 h1:HtqpIVDClZ4nwg75+f6Lvsy/wHu+3BoSGCbBAcpTsTg=
-github.com/stretchr/testify v1.9.0/go.mod h1:r2ic/lqez/lEtzL7wO/rwa5dbSLXVDPFyf8C91i36aY=
+github.com/stretchr/testify v1.10.0 h1:Xv5erBjTwe/5IxqUQTdXv5kgmIvbHo3QQyRwhJsOfJA=
+github.com/stretchr/testify v1.10.0/go.mod h1:r2ic/lqez/lEtzL7wO/rwa5dbSLXVDPFyf8C91i36aY=
 github.com/ugorji/go/codec v1.2.12 h1:9LC83zGrHhuUA9l16C9AHXAqEV/2wBQ4nkvumAE65EE=
 github.com/ugorji/go/codec v1.2.12/go.mod h1:UNopzCgEMSXjBc6AOMqYvWC1ktqTAfzJZUZgYf6w6lg=
-github.com/xmidt-org/wrp-go/v3 v3.6.0 h1:g8qk4Xtzm7f9AslSlhv46syb9FJpDdyOSqVlUa45L7g=
-github.com/xmidt-org/wrp-go/v3 v3.6.0/go.mod h1:eyMj+q/7LQ4SU6Z3s6VOwuTVSh6/DJBb2soBGBFSung=
+github.com/xmidt-org/wrp-go/v3 v3.7.0 h1:m9ghdq79Zzb0WjomUJ02rzFpI0RK8KTjArYpNIwx1fc=
+github.com/xmidt-org/wrp-go/v3 v3.7.0/go.mod h1:eyMj+q/7LQ4SU6Z3s6VOwuTVSh6/DJBb2soBGBFSung=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
diff --git a/options.go b/options.go
index 9e74a15..c7e6b81 100644
--- a/options.go
+++ b/options.go
@@ -21,7 +21,7 @@ func (f optionFunc) apply(file *Packetizer) error {
 }
 
 // ID sets the ID of the stream.  The ID must be a non-empty string containing
-// only [A-Za-z0-9_-].  This is a required field.
+// only [A-Za-z0-9 !#$&'()*+,./:;=?@[\]~_-].  This is a required field.
 func ID(id string) Option {
 	return optionFunc(func(s *Packetizer) error {
 		s.headers.id = id