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[Linphone-developers] Linphone unable to resolve DNS correctly


From: Swinney C.
Subject: [Linphone-developers] Linphone unable to resolve DNS correctly
Date: Sat, 22 Jun 2013 23:05:51 +0100

Hi,

We have tried to use Linphone to make calls to SIP user registered with
SIP address based on our root domain but it appears that the client
cannot resolve DNS entries correctly. 

We have SRV records in the root domain zone along with NAPTR records
such that:

_h323cs._tcp.domain.com                 IN      SRV     0 0 1720
gk.domain.com.
_h323ls._udp.domain.com                 IN      SRV     0 0 1719
gk.domain.com.
_sip._udp.domian.com                            IN      SRV     0 0 5060
gk.domain.com.
_sip._tcp.domian.com                            IN      SRV     0 0 5060
gk.domain.com.
_sip.s_tcp.domian.com                           IN      SRV     0 0 5061
gk.domain.com.

domain.com      NAPTR   30 100 "S" "SIP+D2U" "" _sip._udp.domain.com.
domain.com      NAPTR   20 100 "S" "SIP+D2T" "" _sip._tcp.domain.com.
domain.com      NAPTR   10 100 "S" "SIPS+D2T" "" _sips._tcp.domain.com.



However, we also have an 'A' record in the root domain that points to an
IP address of the webserver. When trying to call anyone using
sip:address@hidden, Linphone is unable to resolve the server that will
handle SIP calls (i.e. gk.domain.com) and insists on trying to contact
the server in the A record.

Output from the Linphone debug shows:
message: eXosip_dnsutils_naptr_lookup: About to ask for domain.com
NAPTR'
message: DNS resolution with domain.com:5060
message: getaddrinfo returned the following addresses:
message: IP_Add_of_A_Record port 5060

This is an issue with Linphone as other clients (Cisco, Ekiga and
others) are able to request SRV records and interpret them correctly.

Is there any chance that Linphone can be developed to use DNS SRV
records as I don't see how it will be able to call SIP addresses based
on a root domain?

Regards,


Chris




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