6 Jul
2007
6 Jul
'07
11:41 a.m.
At 22:57 03/07/2007, Charles Ulrich wrote:
Hi all,
I'm fairly new to SER (just heard about it this afternoon), but I've
already run up against a problem that's vexing me.
We have a Polycom phone sitting behind a Linksys WRT54G router/firewall
with DD-WRT firmware. This version of DD-WRT is the "voip" edition,
meaning it has SER and rtpproxy installed to help ease NAT issues with
SIP.
Hi Charles,
Is the 'voip edition' somewhere available? I would be eager to give it
a try on my WRT too.
I'm a bit sceptical how much we can do about it, since the URIs are part
of the SIP protocol machinery and it is up to discretion of a telephone
implementation to show what it wants to show (there is no standard for
what a telephone shall display).
IMO you are then left with experimenting and changing SIP requests in
a way that increases the chance that the phone shows what you want to
be shown. There is no guarantee however it will work for all phones
in a consistent way.
If I were you, I would try appending P-asserted-identity or Remote-Party-ID
header fields with tel URIs (benefit: use of a header field does not change
request URI, which might have side effects otherwise, and use of TEL
URI eliminates the domain). If that does not work, I would try to
put TEL URI in request-URI.
-jiri
No configuration of SER is necessary, we enter the
WRT54G's IP
address into the phone's outbound proxy field and it just works.
The only drawback is that when using this method, the caller ID on an
incoming call from the PSTN contains a SIP URI (in the form of
sip:5551212@207.179.x.x) instead of a simple telephone number. Our
end-users are pretty voip illiterate and thus haven't the slightest
clue how VoIP works. They are only going to get confused when a SIP URI
shows up on their caller ID instead of the actual PSTN phone number of
the person who called them. How can this be remedied?
I can't tell what version of ser is on this device because the -h and -V
flags return nothing. (Probably to make it slightly smaller for the
embedded platform.) The 'strings' utility wasn't helpful either.
Attached is the ser.cfg that comes with DD-WRT. Any help is greatly
appreciated. Let me know if I need to provide more information.
Thanks!
--
Charles Ulrich
Ideal Solution, LLC -- http://www.idealso.com
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--
Jiri Kuthan http://iptel.org/~jiri/