How to call my Spark SIP URI from another SIP-standards system?

[PWJPW]

Hi All

According to the Spark documentation, we should be able to make calls from any public SIP system to our Spark SIP address, i.e. my.user@me.call.ciscospark.com

However, when trying to make a call in this way, I just get "hostname not found". If I try and perform an nslookup on me.call.ciscospark.com there are no DNS records publically available.

We have the full Spark full service with Webex, Care & Pro Pack etc so it shouldn't be a license poroblem.

Can anyone advise how third parties can call my Spark SIP URI direct from their own SIP system?

Thanks!

James

[George Thomas]

In this case, a SRV record is used. The SRV record used would be _sips._tcp.<domain>.call.ciscospark.com.

[PWJPW]

Thanks. I checked and can see the DNS record:

          priority       = 5

          weight         = 10

          port           = 5061

          svr hostname   = l2sip-cfa-01.wbx2.com

But how does a normal SIP endpoint (external to Cisco) know about this? I.e. If I have a phone registered to an Asterisk server, or some third-party SIP standard endpoint, calling my.user@me.call.ciscospark.com doesn't establish the call...

[Matthew Gurney]

Try this for some more info, SIP SRV is spart of the SIP std. see link below for some more info..

https://www.voip-info.org/wiki/view/Asterisk+SIP+srvlookup

Goodluck

[George Thomas]

In a standards based video environment, the infrastructure goes through and queries the DNS SRV records pertaining to SIP/H323 to find the destination and route the call as needed. One of the SRV records that is queried is what I  mentioned above. In your case, I dont think the Asterisk will do this kind of queries since its a voice endpoint (although I am not an Asterisk expert). If you have a standards based video endpoint like Cisco, Polycom, Lifesize, I would suggest to give it a try and it "should" work.

For some extra reading, refer to the RFC which explains this in detail.

[mh1983]

Did you happen to see the guidelines in this document? Hope it helps.

[PWJPW]

Hi Guys

Thanks very much, I'll check out what Asterisk supports along with any other SIP endpoints.

Cheers

James