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[Linksys 3102 + GrandSteam IP phone] Direct outgoing IP call?

Vincent Delporte
Posts: n/a

I've successfully set up the Linksys to ring up a GrandStream
IP phone directly (ie. with no SIP PBX acting as registrar) when it's
installed on the LAN, but the Linksys fails dialing that IP phone
through the Net.

Both the Linksys and the IP phone are located in private networks with
NAT firewalls standing on both sides, so I imagine I must modify some
settings in the Linksys, but I have no idea what to try besides adding
a STUN server in the SIP section (, and STUN Enable
= Yes), and also configuring up the IP phone to use "NAT Traversal"
and the same STUN server as the Linksys.

FWIW, here's the output when I dial into the Linksys through the PSTN
port (the Linksys uses IP, 087077XXXX is the caller ID
number, is the fixed public IP through which the IP phone
can be reached):

--------------- BEGIN LOG ------------------
<151>FXO:Start CNDD

<151>FXO:CNDD name=, number=087077XXXX

<151>FXO:Stop CNDD

<159>FXO:CNDD Name= Phone=087077XXXX

<151>AUD:Stop PSTN Tone

<151>AUD:Stop PSTN Tone

<151>Calling:(E-Mail Removed):5060

<151>[1:0]AUD ALLOC CALL (port=16394)

<151>[1:0]RTP Rx Up

<159>RSE_DEBUG: reference





INVITE sip:(E-Mail Removed):5060 SIP/2.0
Via: SIP/2.0/UDP;branch=z9hG4bK-5924bcd9
From: fxo <sip:087077XXXX@>;tag=c0823086953a975 1o1
To: <sip:(E-Mail Removed):5060>
Remote-Party-ID: fxo
<sip:087077XXXX@>;screen=yes;party=ca lling
Call-ID: 4e39ec6a-a7c16cbd@
CSeq: 101 INVITE
Max-Forwards: 70
Contact: fxo <sip:087077XXXX@>
Expires: 240
User-Agent: Linksys/SPA3102-3.2.10(GW)
Content-Length: 277
Supported: x-sipura
Content-Type: application/sdp

o=- 19360 19360 IN IP4
c=IN IP4
t=0 0
m=audio 16394 RTP/AVP 0 8 100 101
a=rtpmap:0 PCMU/8000
a=rtpmap:8 PCMA/8000
a=rtpmap:100 NSE/8000
a=fmtp:100 192-193
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-15



<159>[0]FM Alert Stop RxTx (c=0023d298;a=0)

<151>[1:0]AUD Rel Call

<151>CC:Failed w/ Calling

<151>AUD:Stop PSTN Tone

<159>RSE_DEBUG: unref domain,

<159>RSE_DEBUG: last unref for domain

<151>Sess Terminated

<151>AUD:Stop PSTN Tone

--------------- END LOG ------------------

If someone successfully set up the Linksys to call out an IP phone
directly, ie. without first going through a VoIP server, can you tell
me what to change?

Thank you.
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