On Monday, March 2, 2015, Rob Moore <Rob.Moore@aeriandi.com> wrote:

Hi All,

After a recent upgrade of Freeswitch I’ve been seeing some unusual behaviour in codec choice being made by our clients hardware during late negotiation calls.

No other changes have taken place that could have caused this unusual behaviour so we assume that it must be something the newer version of freeswitch is doing in this situation.

Comparing traces before and after the upgrade, the SDP in the final 200 OK’s from our freeswitch now contains more parameters relating to ICE and other source specific attributes. I expect these additional params are what is upsetting our clients hardware.

I’ve since attempted to disable all forms of NAT management in Freeswitch in an attempt to get rid of these extra SDP attributes but none of them seem to have had any effect:

Setting the following in the sip Profile to disable stun / NAT.

http://wiki.freeswitch.org/wiki/Sofia.conf.xml#stun-auto-disable

http://wiki.freeswitch.org/wiki/Sofia.conf.xml#stun-enabled

ensuring the following are set to the local ip of the server

<X-PRE-PROCESS cmd="set" data="external_sip_ip=localIP "/>

<X-PRE-PROCESS cmd="set" data="external_rtp_ip=localIP "/>

Does anyone have any suggestions on how I can remove these additional SDP params?

I’ve included an example good and bad 200 ok in case I’ve missed anything else that’s obvious.

Many thanks

Rob

Bad 200 ok:

SIP/2.0 200 OK

Via: SIP/2.0/UDP 172.18.4.78;branch=z9hG4bK0ba4.7a1f3a47e3eb3a2a4e8e13fd7dda8ab8.0

Via: SIP/2.0/UDP 10.9.138.26:5060;rport=5060;branch=z9hG4bK9ivhm3hvpf5c7vrsu2gh7ou4o2

Record-Route: <sip: 172.18.4.78;r2=on;lr=on;rtpi=1;nat=yes>

Record-Route: <sip:10.16.0.3;r2=on;lr=on;rtpi=1;nat=yes>

From: <sip:8448224432@10.150.35.124>;tag=130e56d9-dcc0-4483-9c8e-edf93ab1fb9a-33986537

To: <sip:00353876721075@10.9.138.9>;tag=r3ZZc86S529mD

Call-ID: b87ef500-4f012e3b-1f738-7c23960a@10.150.35.124

CSeq: 101 INVITE

Contact: <sip:mod_sofia@172.18.4.251:5060>

User-Agent: Aeriandi Tel Server

Allow: INVITE, ACK, BYE, CANCEL, OPTIONS, MESSAGE, INFO, UPDATE, REGISTER, REFER, NOTIFY, PUBLISH, SUBSCRIBE

Supported: path, replaces

Allow-Events: talk, hold, conference, presence, as-feature-event, dialog, line-seize, call-info, sla, include-session-description, presence.winfo, message-summary, refer

Content-Type: application/sdp

Content-Disposition: session

Content-Length: 841

x-nt-location: -1

v=0

o=FreeSWITCH 1425007009 1425007010 IN IP4 172.18.4.251

s=FreeSWITCH

c=IN IP4 172.18.4.251

t=0 0

a=msid-semantic: WMS hGYoorbKxEnXtlapBPoffcf3QQg7ijgq

m=audio 19630 RTP/SAVPF 18 0 8 101

a=rtpmap:18 G729/8000

a=rtpmap:0 PCMU/8000

a=rtpmap:8 PCMA/8000

a=rtpmap:101 telephone-event/8000

a=fingerprint:sha-256 18:6A:21:5F:BF:02:8B:52:29:96:85:6B:05:99:B2:9D:C7:B3:26:DB:F9:32:5A:90:51:62:E8:21:3E:C2:23:C3

a=rtcp-mux

a=rtcp:19630 IN IP4 172.18.4.251

a=ssrc:3641993291 cname:Q4E4mGFKbSxu4yJv

a=ssrc:3641993291 msid:hGYoorbKxEnXtlapBPoffcf3QQg7ijgq a0

a=ssrc:3641993291 mslabel:hGYoorbKxEnXtlapBPoffcf3QQg7ijgq

a=ssrc:3641993291 label:hGYoorbKxEnXtlapBPoffcf3QQg7ijgqa0

a=ice-ufrag:eYAj0GcHniFvsLL8

a=ice-pwd:Gg3SMysNgP8bdIwhwXqnttUH

a=candidate:1204810811 1 udp 659136 172.18.4.251 19630 typ host generation 0

a=ptime:20

good 200 ok:

SIP/2.0 200 OK

Via: SIP/2.0/UDP 172.18.4.78;branch=z9hG4bKef6a.6cc24c86d42011b141c967c04c23e077.0

Via: SIP/2.0/UDP 10.9.138.26:5060;rport=5060;branch=z9hG4bKa2v9mvku4854npk24c4tn51vv2

Record-Route: <sip:172.18.4.78;r2=on;lr=on;rtpi=1;nat=yes>

Record-Route: <sip:10.16.0.3;r2=on;lr=on;rtpi=1;nat=yes>

From: <sip:8448224432@10.151.35.123>;tag=130e56d9-dcc0-4483-9c8e-edf93ab1fb9a-33990014

To: <sip:07940845322@10.9.138.9>;tag=Fy3a1Zv7Kt6Xm

Call-ID: f59cb480-4f014116-1f782-7b23970a@10.151.35.123

CSeq: 101 INVITE

Contact: <sip:mod_sofia@172.18.4.254:5060>

User-Agent: Aeriandi Tel Server

Allow: INVITE, ACK, BYE, CANCEL, OPTIONS, MESSAGE, INFO, UPDATE, REGISTER, REFER, NOTIFY, PUBLISH, SUBSCRIBE

Supported: precondition, path, replaces

Allow-Events: talk, hold, conference, presence, dialog, line-seize, call-info, sla, include-session-description, presence.winfo, message-summary, refer

Content-Type: application/sdp

Content-Disposition: session

Content-Length: 224

x-nt-location: -1

v=0

o=FreeSWITCH 1425014601 1425014602 IN IP4 172.18.4.254

s=FreeSWITCH

c=IN IP4 172.18.4.254

t=0 0

m=audio 16858 RTP/AVP 18 0 8 101

a=fmtp:18 annexb=no

a=rtpmap:101 telephone-event/8000

a=fmtp:101 0-16

a=ptime:20