topic Re: How to call my Spark SIP URI from another SIP-standards system? in Collaboration Applications

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

PWJPW — Mon, 18 Mar 2019 02:11:19 GMT

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

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

George Thomas — Wed, 08 Nov 2017 23:49:49 GMT

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

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

PWJPW — Thu, 09 Nov 2017 00:04:10 GMT

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...

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

Matthew Gurney — Thu, 09 Nov 2017 00:12:02 GMT

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

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

George Thomas — Thu, 09 Nov 2017 00:16:43 GMT

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.

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

mh1983 — Thu, 09 Nov 2017 12:47:01 GMT

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

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

PWJPW — Fri, 10 Nov 2017 08:36:00 GMT

Hi Guys

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

Cheers

James