[Freeswitch-users] Why doesn't this call get answered?

[Brian West]

That's the FMTP for OPUS.  Chances are that invite breaks the Polycom, what
does the SDP look like coming back from that invite? I'll be you, it's
broken.

/b


On Wed, Apr 14, 2021 at 1:51 PM Bote Man <botelist at gmail.com> wrote:

> I am absolutely no expert on SDP, but that SDP line that begins
>
> a=fmtp:102 useinbandfec=1…
>
> looks to me like it’s trying to set up a video call. I saw this behavior
> with the newer Polycom VVX501 before I beat those eager beavers into
> submission.
>
>
> It also looks like the Grandstream is offering a lot more codecs which you
> might prefer to trim down to only those necessary to get the job done.
> Sometimes additional codecs or codecs listed in the “wrong” sequence can
> cause mystery problems.
>
>
>
> You might have to resort to siptrace logging between FS and your carrier.
>
> sofia profile external siptrace on ç or whatever profile handles your
> provider; or maybe internal to snoop what’s going on between FS and your
> Grandstream.
>
>
>
> Hope this helps.
>
>
>
>
>
> ---
>
> John Boteler
>
> BnC Group U.S.A.
>
>
>
>
>
>
>
>
>
> *From:* FreeSWITCH-users <freeswitch-users-bounces at lists.freeswitch.org> *On
> Behalf Of *Steven Schoch
> *Sent:* Tuesday, 13 April, 2021 20:47
> *To:* freeswitch-users <freeswitch-users at lists.freeswitch.org>
> *Subject:* [Freeswitch-users] Why doesn't this call get answered?
>
>
>
> This office has a bunch of Polycom SoundPoint IP 320 phones, and a single
> Grandstream HT801 (connected to a FAX machine for outgoing FAXes).
>
>
>
> I can make a call from the phones to outside numbers.
>
> I can make a call from the HT801 to local phones.
>
> But I can't call from the HT801 to outside numbers.
>
>
>
> The last important thing that happens in the failed call is this:
>
> 2021-04-13 17:28:15.260844 [DEBUG] sofia.c:7406 Channel
> sofia/external/<number> entering state [calling][0]
>
>
>
> The difference between the work and not work seems to be this: When I call
> from a phone to an outside number, it does this:
>
>
>
> Local SDP:
> v=0
> o=FreeSWITCH 1618335260 1618335261 IN IP4 <external-IP>
> s=FreeSWITCH
> c=IN IP4 <external-IP>
> t=0 0
> m=audio 25104 RTP/AVP 0 8 101
> a=rtpmap:0 PCMU/8000
> a=rtpmap:8 PCMA/8000
> a=rtpmap:101 telephone-event/8000
> a=fmtp:101 0-16
> a=ptime:20
> a=sendrecv
>
>
>
> When it tries to call from the HT801 to an outside number, it does this:
>
>
>
> Local SDP:
>
> v=0
> o=FreeSWITCH 1618327543 1618327544 IN IP4 <external-IP>
> s=FreeSWITCH
> c=IN IP4 <external-IP>
> t=0 0
> m=audio 32552 RTP/AVP 0 8 102 9 101 103
> a=rtpmap:0 PCMU/8000
> a=rtpmap:8 PCMA/8000
> a=rtpmap:102 opus/48000/2
> a=fmtp:102 useinbandfec=1; maxaveragebitrate=30000; maxplaybackrate=48000;
> ptime=20; minptime=10; maxptime=40; stereo=1
> a=rtpmap:9 G722/8000
> a=rtpmap:101 telephone-event/8000
> a=fmtp:101 0-16
> a=rtpmap:103 telephone-event/48000
> a=fmtp:103 0-16
> a=ptime:20
> a=sendrecv
>
>
>
> Is that why it doesn't answer? If so, how do I change it?
>
>
>
> I should mention that when I tried this at home, it worked, but when I
> attempted to install it here at the bookstore, it didn't. The Comcast
> router at my home is a little different; they use a Netgear router here;
> and I may have upgraded Freeswitch between the time it worked and now.
>
>
>
> --
>
> Steve
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