viljoens at verishare....
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 Posted: Fri May 15, 2015 2:32 am Post subject: [asterisk-users] asterisk-users Digest, Vol 130, Issue 14 |
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----- Original Message -----
| Quote: | From: "Steve Davies" <davies147@gmail.com>
To: "Asterisk Users Mailing List - Non-Commercial Discussion"
<asterisk-users@lists.digium.com>
Sent: Wednesday, May 13, 2015 11:39:29 AM
Subject: Re: [asterisk-users] "Retransmission Timeout" results in
dropped calls after 32 seconds
Hi,
In my experience, all Yealink phones work just fine with Asterisk, we
have hundreds (perhaps even low-thousands) out there with customers on
Asterisk 1.2, 1.6.2, 1.8 and 11.
If you are accurately representing the SIP trace on the phone and the
SIP trace on Asterisk, then I would strongly suggest a SIP ALG exists
in the network between the two devices and that SIP ALG does not
understand SIP properly. The two halves simply do not match, so
something must surely be interfering.
In my experience it is often an innocent looking Cisco router. Cisco's
SIP implementation is "SIP By Cisco" rather than "RFC compliant SIP".
If that is the case Cisco call it a "SIP fixup" and you just need to
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disable it.
| Quote: |
Hope that helps,
Steve
Steve,
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| Quote: | That is an interesting point - the server and the phone are both connected
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to Netgear switches where I have enabled their "Auto-VoIP" feature, which
remarks packets based on protocol (SIP, SCCP, etc) for better QoS:
| Quote: | http://kb.netgear.com/app/answers/detail/a_id/21758
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| Quote: | I wonder if this remarking process is modifying another part of the packet
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too?
| Quote: | Both devices are on the same subnet, so although these switches do route
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traffic as well, that shouldn't be coming into play here.
We had a very specific issue at a client recently with Yealink phones and
Cisco routers. No Yealink we plugged in would pick up an IP from the DHCP
server so it could be configured.
To correct it we had to explicitly turn off LLDP (link layer discovery
protocol) on the Yealinks in order to get them to work on the Cisco'ed
network.
Did not fool around with the Cisco to try and solve the issue, and still
don't know exactly what was going wrong, but it seems defined that using
recent model Yealink phones on a network with a recent Cisco router, either
turn off LLDP on the phones or the router to prevent problems.
The above still did not solve the issues completely, still getting one or
two complaints from this customer every few days which also seem to be
related to the fact of using Yealink phones with a network where a Cisco
router is present... so your milage may vary.
Stefan
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