[Freeswitch-users] Hostname vs IP in SDP

[Colin Morelli]

So in this case I would just have to generate two invites (one for each
profile) both to Kamailio, and then filter contacts in Kamailio (v6 invite
goes to v6 registrations, v4 to v4, etc)?

In any case, my use for setting something like advertised_rtp_ip (does
anything like this exist?) would be to actually explicitly set a hostname
(rather than an IP) for certain endpoints that are going to have
compatibility issues with IP literals (such as iOS devices). I used a poor
example there, as I wasn't intending to cross the v4/v6 bridge with it.

Best,
Colin

On Wed, Aug 3, 2016 at 10:42 AM Brian West <brian at freeswitch.org> wrote:

> You should NOT be setting advertised_rtp_ip, We use a V4 profile or aV6
> profile, you can't mix and match, doing so would probably not work at all.
>
> On Wed, Aug 3, 2016 at 8:53 AM, Colin Morelli <colin.morelli at gmail.com>
> wrote:
>
>> Interesting. So far it has worked on all clients except WebRTC. It seems
>> strange to me that putting a hostname in an SDP wouldn't be allowed, but
>> it's far from the weirdest thing I've seen in some these specs.
>>
>> I'm fine with having IPs in the SDP for pretty much all cases, except for
>> the iPhone where it is supposedly necessary to not use IP literals. So I
>> guess I have two questions then:
>>
>> 1. Is there a way in FS to explicitly set an advertised IP address
>> through a channel var? Actually, in this case I would just define a few
>> options in vars.xml and then use expansion. Something like,
>> advertised_rtp_ip=${local_ipv4} or advertised_rtp_ip=${local_ipv6}
>>
>> 2. How are people deciding whether to advertise IPv4/IPv6 if FS *isn't* handling
>> registrations. Say, for example, Kamailio handles registrations. FS only
>> knows if it'll talk to Kamailio via 4 or 6, but not what Kamailio will use
>> to talk to the clients. Is there a best practice here for supporting dual
>> stack?
>>
>> Best,
>> Colin
>>
>> On Wed, Aug 3, 2016 at 1:13 AM Michael Jerris <mike at jerris.com> wrote:
>>
>>> I have not once in my life seen someone use a hostname instead of an ip
>>> in an sdp, and I do not believe it is legal.
>>>
>>> > On Aug 2, 2016, at 1:00 PM, Colin Morelli <colin.morelli at gmail.com>
>>> wrote:
>>> >
>>> > Hey all,
>>> >
>>> > So it looks like WebRTC has issues dealing with hostnames in the SDP
>>> instead of IP addresses. Particularly, when including a hostname in the SDP
>>> there's no audio in either direction. This is the case in both the latest
>>> Firefox + Chrome browsers.
>>> >
>>> > This is particularly problematic for applications that are WebRTC +
>>> mobile, now that Apple is enforcing applications to support IPv6-only
>>> networks. Using hostnames in the record-route and SDP addresses meets the
>>> requirement since the OS will synthesize an IPv6 address when a DNS query
>>> is performed, but according to the documentation they strongly urge
>>> applications to avoid using address literals in their applications.
>>> >
>>> > Has anyone had success with methods to switch between advertising a
>>> hostname vs IP address in the SDP? Or other methods for solving this
>>> problem?
>>>
>>>
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>
>
>
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