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lacibaci

join:2000-04-10
Export, PA

Help with VOIP

I have a problem with incoming calls with my VOIP provider (callcentric.com) When I signed up a few weeks ago, all of their servers used standard port (5060) and I was able to make calls (in/out) just by enabling SIP ALG option.
About 3 weeks ago, Callcentric was a victim of DDOS (and still recovering) Somewhere around that time CC switched to use DNS SVR (from DNS A) to help distribute the load.
Unfortunately (for me) the new servers also use non standard ports:

...
_sip._udp.callcentric.com. 2 IN SRV 20 0 10123 alpha11.callcentric.com.
_sip._udp.callcentric.com. 2 IN SRV 20 0 10123 alpha12.callcentric.com.
_sip._udp.callcentric.com. 2 IN SRV 20 0 5080 alpha1.callcentric.com.
_sip._udp.callcentric.com. 2 IN SRV 20 0 5080 alpha2.callcentric.com.
...

Ever since this change, incoming calls started randomly getting rejected by ZyWALL. The only way I could make it work, was to add ports 5080 and 10123 to the SIP signalling port list (see attached pic) Obviously, this is not optimal as I will have to keep an eye on ports used by CC.
Is this the right way of doing it?
BTW, this ZyWALL USG50 3.0, and OBi100 ATA.


Brano
I hate Vogons
Premium,MVM
join:2002-06-25
Burlington, ON
kudos:11
Reviews:
·TekSavvy DSL
·Bell Fibe
It seems that they're using 5080 and 10123 only so you should be all set (for now).
If they add new port then you have to add it manually.
I would hope/expect that they would inform the client base if they change/add ports.

brano@droopy ~ $ host -t srv _sip._udp.callcentric.com
;; Truncated, retrying in TCP mode.
_sip._udp.callcentric.com has SRV record 20 0 5080 alpha1.callcentric.com.
_sip._udp.callcentric.com has SRV record 20 0 5080 alpha2.callcentric.com.
_sip._udp.callcentric.com has SRV record 20 0 5080 alpha3.callcentric.com.
_sip._udp.callcentric.com has SRV record 20 0 5080 alpha4.callcentric.com.
_sip._udp.callcentric.com has SRV record 20 0 5080 alpha5.callcentric.com.
_sip._udp.callcentric.com has SRV record 20 0 5080 alpha6.callcentric.com.
_sip._udp.callcentric.com has SRV record 20 0 5080 alpha7.callcentric.com.
_sip._udp.callcentric.com has SRV record 20 0 5080 alpha8.callcentric.com.
_sip._udp.callcentric.com has SRV record 20 0 5080 alpha9.callcentric.com.
_sip._udp.callcentric.com has SRV record 20 0 5080 alpha10.callcentric.com.
_sip._udp.callcentric.com has SRV record 20 0 5080 alpha11.callcentric.com.
_sip._udp.callcentric.com has SRV record 20 0 5080 alpha12.callcentric.com.
_sip._udp.callcentric.com has SRV record 20 0 5080 alpha13.callcentric.com.
_sip._udp.callcentric.com has SRV record 20 0 5080 alpha14.callcentric.com.
_sip._udp.callcentric.com has SRV record 20 0 5080 alpha15.callcentric.com.
_sip._udp.callcentric.com has SRV record 20 0 5080 alpha16.callcentric.com.
_sip._udp.callcentric.com has SRV record 20 0 5080 alpha17.callcentric.com.
_sip._udp.callcentric.com has SRV record 20 0 5080 alpha18.callcentric.com.
_sip._udp.callcentric.com has SRV record 20 0 10123 alpha1.callcentric.com.
_sip._udp.callcentric.com has SRV record 20 0 10123 alpha2.callcentric.com.
_sip._udp.callcentric.com has SRV record 20 0 10123 alpha3.callcentric.com.
_sip._udp.callcentric.com has SRV record 20 0 10123 alpha4.callcentric.com.
_sip._udp.callcentric.com has SRV record 20 0 10123 alpha5.callcentric.com.
_sip._udp.callcentric.com has SRV record 20 0 10123 alpha6.callcentric.com.
_sip._udp.callcentric.com has SRV record 20 0 10123 alpha7.callcentric.com.
_sip._udp.callcentric.com has SRV record 20 0 10123 alpha8.callcentric.com.
_sip._udp.callcentric.com has SRV record 20 0 10123 alpha9.callcentric.com.
_sip._udp.callcentric.com has SRV record 20 0 10123 alpha10.callcentric.com.
_sip._udp.callcentric.com has SRV record 20 0 10123 alpha11.callcentric.com.
_sip._udp.callcentric.com has SRV record 20 0 10123 alpha12.callcentric.com.
_sip._udp.callcentric.com has SRV record 20 0 10123 alpha13.callcentric.com.
_sip._udp.callcentric.com has SRV record 20 0 10123 alpha14.callcentric.com.
_sip._udp.callcentric.com has SRV record 20 0 10123 alpha15.callcentric.com.
_sip._udp.callcentric.com has SRV record 20 0 10123 alpha16.callcentric.com.
_sip._udp.callcentric.com has SRV record 20 0 10123 alpha17.callcentric.com.
_sip._udp.callcentric.com has SRV record 20 0 10123 alpha18.callcentric.com.
_sip._udp.callcentric.com has SRV record 20 0 10123 alpha19.callcentric.com.
_sip._udp.callcentric.com has SRV record 20 0 10123 alpha20.callcentric.com.