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T46G Dialing with leading 0 and VPN fails with "Unknown URI scheme"
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stone198 Offline
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Posts: 4
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Post: #1
T46G Dialing with leading 0 and VPN fails with "Unknown URI scheme"
Hello,

I always get an "Unknown URI scheme" when I dial a number via VPN with leading 0 (all national numbers here in Germany). This only happens with numbers with leading 0. All other numbers work.
This only happens, when VPN is active, I tested with
  • 28.73.0.50.rom
  • 28.73.193.50.rom
  • 28.73.0.50.rom
  • T46-28.80.0.70.rom
Just to stress it; this only happens, when a number is dialled with the phone registred via VPN to the telephony server. When VPN is on, but the phone is registered to the PBX with the normal, local PBX IP, it's fine.

Phones Syslog shows:
Code:
Dec 10 22:22:15 sua [591]: DNS <3+error > [SIP] Query error: 'Domain name not found'
Dec 10 22:22:15 sua [591]: DNS <4+warnin> [SIP] Here query have no record, so try A query last time...
Dec 10 22:22:15 sua [591]: DNS <6+info  > [SIP] New query: type=1 class=1 target=060811234567
Dec 10 22:22:15 sua [591]: DNS <6+info  > [SIP] Query result: status=4
Dec 10 22:22:15 sua [591]: DNS <3+error > [SIP] Query error: 'Domain name not found'
Dec 10 22:22:15 sua [591]: SUA <3+error > [016] DNS resolver fail, unknown destination...
Dec 10 22:22:15 sua [591]: DLG <5+notice> [016] cb_transport_error (id=93)^M
Dec 10 22:22:15 sua [591]: DLG <6+info  > [016] cb_nict_kill_transaction (id=93)^M
Dec 10 22:22:15 sua [591]: SUA <6+info  > [016] ****eCore event:(0x0012)ECORE_CALL_REQUESTFAILURE        ****
Dec 10 22:22:15 sua [591]: CAL <6+info  > [016] call no response! cid 32781
So he tries to makes a DNS query to a DNS server with the phone number (for other phone numbers it does not) and fails.

In fact, when grepping traffic from the phone on the DNS server, I can see that the phone tries to resolve the phone number
Code:
U 192.168.178.109:44784 -> 192.168.178.215:53
J............_sip._udp.06081123456..!..
#
U 192.168.178.215:53 -> 192.168.178.109:44784
J............_sip._udp.06081123456..!............@.a.root-servers.net..nstld.verisign-grs.com.x.Ni..........:...Q.
#
U 192.168.178.109:44784 -> 192.168.178.215:53
.............06081123456.....
#
U 192.168.178.215:53 -> 192.168.178.109:44784
.............06081123456.............!.@.a.root-servers.net..nstld.verisign-grs.com.x.Ni..........:...Q.

For me, this seems to be a bug in the Firmwares. Yelaink: Please correct this, as my customer using this phone cannot dial any Germany national number.

Question: Is there a way to overcome this? Can we somehow disable DNS queries for this case? Maybe through Provisioning?
12-11-2015 05:24 PM
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T46G Dialing with leading 0 and VPN fails with "Unknown URI scheme" - stone198 - 12-11-2015 05:24 PM

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