[asterisk-users] No compatible codecs, not accepting this offer!

[Francesco Namuri]

Hello,
I'm having this issue on my pbx, it appears that asterisk is refusing
the codecs that my providers is proposing.
My trunk configuration is:

---
username=5x5x7x9x0x3
type=friend
secret=CRcxn7sqwm
qualify=yes
port=5060
insecure=port,invite
host=sip.txtxlxoxp.it
fromuser=5x5x7x9x0x3
fromdomain=sip.txtxlxoxp.it
disallow=all
context=from-trunk
allow=alaw
---

A typical invite from my provider is:

<--- SIP read from UDP:xx.yy.xx.yy:5060 ---> INVITE sip:5x5x7x9x0x3 at 192.168.1.168:5060 SIP/2.0
Via: SIP/2.0/UDP xx.yy.xx.yy:5060;branch=z9hG4bKt5sfh7nrvok3d5gqc3ritdv7b7
From: <sip:3x8x6x3x3x at 10.39.1.19;user=phone>;tag=SDdgce901-90915
To: "SIPLineUser SIPLineUser"<sip:5x5x7x9x0x3 at sip.txtxlxoxp.it>
Call-ID: SDdgce901-9cb68ba025684f03a4094ed71e6e04f8-ao92gd1
CSeq: 59458 INVITE
Content-Type: application/sdp
Contact: <sip:3x8x6x3x3x at xx.yy.xx.yy:5060;user=phone;transport=udp>
User-Agent: Nortel SESM 14.1.0.12
Max-Forwards: 19
Supported: com.nortelnetworks.firewall,p-3rdpartycontrol,nosec,join,x-nortel-sipvc,gin,com.nortelnetworks.im.encryption,replaces,100rel
Remote-Party-ID: <sip:3x8x6x3x3x at sip.txtxlxoxp.it;user=phone>;screen=yes;screen-ind=0;party=calling;counter=0;npi=NPI_E164;ton=TON_NATIONAL
P-Asserted-Identity: <sip:3x8x6x3x3x at 10.39.1.19;user=phone>
Allow: UPDATE,REFER
Content-Length: 293

v=0
o=- 0 138163748 IN IP4 xx.yy.xx.yy
s=IMSS
e=unknown at invalid.net
c=IN IP4 xx.yy.xx.yy
t=0 0
m=audio 43718 RTP/AVP 8 18 3 101
a=fmtp:18 annexb=no
a=rtpmap:18 G729/8000
a=rtpmap:3 GSM/8000/1
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-15
a=sqn: 0
a=cdsc: 1 image udptl t38
<------------->

<--- SIP read from UDP:xx.yy.xx.yy:5060 ---> INVITE sip:5x5x7x9x0x3 at 192.168.1.168:5060 SIP/2.0
Via: SIP/2.0/UDP xx.yy.xx.yy:5060;branch=z9hG4bKt5sfh7nrvok3d5gqc3ritdv7b7
From: <sip:3x8x6x3x3x at 10.39.1.19;user=phone>;tag=SDdgce901-90915
To: "SIPLineUser SIPLineUser"<sip:5x5x7x9x0x3 at sip.txtxlxoxp.it>
Call-ID: SDdgce901-9cb68ba025684f03a4094ed71e6e04f8-ao92gd1
CSeq: 59458 INVITE
Content-Type: application/sdp
Contact: <sip:3x8x6x3x3x at xx.yy.xx.yy:5060;user=phone;transport=udp>
User-Agent: Nortel SESM 14.1.0.12
Max-Forwards: 19
Supported: com.nortelnetworks.firewall,p-3rdpartycontrol,nosec,join,x-nortel-sipvc,gin,com.nortelnetworks.im.encryption,replaces,100rel
Remote-Party-ID: <sip:3x8x6x3x3x at sip.txtxlxoxp.it;user=phone>;screen=yes;screen-ind=0;party=calling;counter=0;npi=NPI_E164;ton=TON_NATIONAL
P-Asserted-Identity: <sip:3x8x6x3x3x at 10.39.1.19;user=phone>
Allow: UPDATE,REFER
Content-Length: 293

v=0
o=- 0 138163748 IN IP4 xx.yy.xx.yy
s=IMSS
e=unknown at invalid.net
c=IN IP4 xx.yy.xx.yy
t=0 0
m=audio 43718 RTP/AVP 8 18 3 101
a=fmtp:18 annexb=no
a=rtpmap:18 G729/8000
a=rtpmap:3 GSM/8000/1
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-15
a=sqn: 0
a=cdsc: 1 image udptl t38
<------------->

I noted that in the invite I get the rtpmap attribute only for codec 18,
3 but not for 8, it could be a problem?

The refuse is:

<--- Reliably Transmitting (NAT) to xx.yy.xx.yy:5060 --->
SIP/2.0 488 Not acceptable here^M
Via: SIP/2.0/UDP 77.239.128.7:5060;branch=z9hG4bKt5sfh7nrvok3d5gqc3ritdv7b7;received=77.239.128.7;rport=5060^M
From: <sip:3x8x6x3x3x at 10.39.1.19;user=phone>;tag=SDdgce901-90915^M
To: "SIPLineUser SIPLineUser"<sip:5x5x7x9x0x3 at sip.totalvoip.it>;tag=as08516b97^M
Call-ID: SDdgce901-9cb68ba025684f03a4094ed71e6e04f8-ao92gd1^M
CSeq: 59458 INVITE^M
Server: FPBX-2.11.0(10.12.3)^M
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY, INFO, PUBLISH^M
Supported: replaces, timer^M
Reason: Q.850;cause=58^M
Content-Length: 0^M
^M

<------------>


Have you any advice on how to troubleshoot it?

Thanks in advance

All the best,
Francesco Namuri