The Peplink Balance 300 (BA300) running latest firmware (v4.8.1 build 1259) only supports UDP SIP ALG and not SIP ALG over TCP connection.
Feature requests:
- improve documentation regarding VoIP and SIP ALG, to specify for which transport protocols (udp,tcp,tls) SIP ALG is supported on which Balance model.
- please add TCP SIP ALG for Balance 300 devices
- documentation that explains how to “fix” BA300 for VoIP providers that error out with “SIP/2.0 479 Please don’t use private IP addresses”; the solution is to create an outbound firewall rule that blocks TCP traffic to the SIP port (default: 5060) of the VoIP provider.
Evidence that Peplink Balance 300 (BA300) only supports UDP SIP ALG and not SIP ALG over TCP connections gathered using sip-alg-detector:
Test Results:
- SIP UDP ALG: TRUE
- SIP TCP ALG: FALSE
INFO: There are differences between sent request and received mirrored request:
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
--2c2--
Sent from this host : Via: SIP/2.0/UDP 192.168.254.11:5065;rport;branch=z9hG4bKxuxt8fr8
Received by server : Via: SIP/2.0/UDP 8.1.2.1:5065;rport;branch=z9hG4bKxuxt8fr8
--8c8--
Sent from this host : Contact: <sip:[email protected]:5065;transport=udp>
Received by server : Contact: <sip:[email protected]:5065;transport=udp>
--16c16--
Sent from this host : c=IN IP4 192.168.254.11
Received by server : c=IN IP4 8.1.2.1
----------------------------------------------------------
$ ruby sip-alg-detector.rb -n -si 9.1.1.5 -lp 5065 (23-11-11 00:04)
Settings:
- Test UDP: true
- Test TCP: true
- Server IP: 9.1.1.5
- Server port: 5060
- Local port: 5065
INFO: Starting the SIP UDP ALG test...
DEBUG: Connecting to the server (UDP:9.1.1.5:5060) ...
DEBUG: Sending the SIP request to the server ...
DEBUG: Sent from 192.168.254.11:5065 to 9.1.1.5:5060:
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
INVITE sip:[email protected]:5060 SIP/2.0
Via: SIP/2.0/UDP 192.168.254.11:5065;rport;branch=z9hG4bKxuxt8fr8
Max-Forwards: 5
To: <sip:[email protected]:5060>
From: "SIP ALG Detector" <sip:[email protected]>;tag=npvdd1qe
Call-ID: [email protected]
CSeq: 76 INVITE
Contact: <sip:[email protected]:5065;transport=udp>
Allow: INVITE
Content-Type: application/sdp
Content-Length: 254
v=1
o=dykh4e87 26185007 8583724 IN IP4 192.168.254.11
s=-
c=IN IP4 192.168.254.11
t=0 0
m=audio 2656 RTP/AVP 8 0 3 101
a=rtpmap:8 PCMA/8000
a=rtpmap:0 PCMU/8000
a=rtpmap:3 GSM/8000
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-15
a=ptime:20
----------------------------------------------------------
DEBUG: Waiting for the responses from the server ...
DEBUG: 1/2 responses received
DEBUG: 2/2 responses received
DEBUG: Mirrored request sent in the response from the server:
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
INVITE sip:[email protected]:5060 SIP/2.0
Via: SIP/2.0/UDP 8.1.2.1:5065;rport;branch=z9hG4bKxuxt8fr8
Max-Forwards: 5
To: <sip:[email protected]:5060>
From: "SIP ALG Detector" <sip:[email protected]>;tag=npvdd1qe
Call-ID: [email protected]
CSeq: 76 INVITE
Contact: <sip:[email protected]:5065;transport=udp>
Allow: INVITE
Content-Type: application/sdp
Content-Length: 254
v=1
o=dykh4e87 26185007 8583724 IN IP4 192.168.254.11
s=-
c=IN IP4 8.1.2.1
t=0 0
m=audio 2656 RTP/AVP 8 0 3 101
a=rtpmap:8 PCMA/8000
a=rtpmap:0 PCMU/8000
a=rtpmap:3 GSM/8000
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-15
a=ptime:20
----------------------------------------------------------
INFO: There are differences between sent request and received mirrored request:
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
--2c2--
Sent from this host : Via: SIP/2.0/UDP 192.168.254.11:5065;rport;branch=z9hG4bKxuxt8fr8
Received by server : Via: SIP/2.0/UDP 8.1.2.1:5065;rport;branch=z9hG4bKxuxt8fr8
--8c8--
Sent from this host : Contact: <sip:[email protected]:5065;transport=udp>
Received by server : Contact: <sip:[email protected]:5065;transport=udp>
--16c16--
Sent from this host : c=IN IP4 192.168.254.11
Received by server : c=IN IP4 8.1.2.1
----------------------------------------------------------
__________________________________________________________________
INFO: SIP UDP ALG test result: TRUE
INFO: It seems that your router is performing ALG for SIP UDP
__________________________________________________________________
INFO: Starting the SIP TCP ALG test...
DEBUG: Connecting to the server (TCP:9.1.1.5:5060) ...
DEBUG: Sending the SIP request to the server ...
DEBUG: Sent from 192.168.254.11:56624 to 9.1.1.5:5060:
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
INVITE sip:[email protected]:5060 SIP/2.0
Via: SIP/2.0/TCP 192.168.254.11:5065;rport;branch=z9hG4bKrhmmc7hh
Max-Forwards: 5
To: <sip:[email protected]:5060>
From: "SIP ALG Detector" <sip:[email protected]>;tag=ycghjnag
Call-ID: [email protected]
CSeq: 424 INVITE
Contact: <sip:[email protected]:5065;transport=tcp>
Allow: INVITE
Content-Type: application/sdp
Content-Length: 254
v=0
o=yydggxnx 33525472 3332642 IN IP4 192.168.254.11
s=-
c=IN IP4 192.168.254.11
t=0 0
m=audio 3356 RTP/AVP 8 0 3 101
a=rtpmap:8 PCMA/8000
a=rtpmap:0 PCMU/8000
a=rtpmap:3 GSM/8000
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-15
a=ptime:20
----------------------------------------------------------
DEBUG: Waiting for the responses from the server ...
DEBUG: 1/2 responses received
DEBUG: 2/2 responses received
DEBUG: Mirrored request sent in the response from the server:
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
INVITE sip:[email protected]:5060 SIP/2.0
Via: SIP/2.0/TCP 192.168.254.11:5065;rport;branch=z9hG4bKrhmmc7hh
Max-Forwards: 5
To: <sip:[email protected]:5060>
From: "SIP ALG Detector" <sip:[email protected]>;tag=ycghjnag
Call-ID: [email protected]
CSeq: 424 INVITE
Contact: <sip:[email protected]:5065;transport=tcp>
Allow: INVITE
Content-Type: application/sdp
Content-Length: 254
v=0
o=yydggxnx 33525472 3332642 IN IP4 192.168.254.11
s=-
c=IN IP4 192.168.254.11
t=0 0
m=audio 3356 RTP/AVP 8 0 3 101
a=rtpmap:8 PCMA/8000
a=rtpmap:0 PCMU/8000
a=rtpmap:3 GSM/8000
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-15
a=ptime:20
----------------------------------------------------------
INFO: No differences between sent request and received mirrored request
__________________________________________________________________
INFO: SIP TCP ALG test result: FALSE
INFO: It seems that your router is not performing ALG for SIP TCP
__________________________________________________________________
##################################################################
# Test Results:
## - SIP UDP ALG: TRUE
### - SIP TCP ALG: FALSE
##################################################################
Return code: 21