[asterisk-users] PJSIP Returning 421 Extension Required

Trey Hilyard kctrey at gmail.com
Wed Jan 13 12:58:18 CST 2016


I am turning up a PJSIP Endpoint and am having problems when they send an
INVITE to my server. Asterisk is returning a 421 Extenstion Required. Since
"extension" means different things in the SIP stack versus Asterisk, I
don't know what it is complaining about.

I have attached the trace below. Nothing else shows up with core verbose or
core debug enabled, so I am assuming it has to be dying at the PJSIP
module. The INVITE does come from an abnormal UDP Port, which is also shown
in the Via header, but the fact that the PBX is responding makes me think
that isn't the culprit.

Any thoughts?

SIP Logger:
INVITE sip:+18165116504 at 12.4.240.200:5060;user=phone SIP/2.0
v: SIP/2.0/UDP 10.77.27.103:20065
;branch=z9hG4bK0020C575A392E895C39051;oc-accept
Max-Forwards: 70
t: <sip:+18165116504 at 12.4.240.200;user=phone>
f: <sip:+18165116504 at 10.77.27.103;user=phone>;tag=000010847511385389740959
i: 117620342110831512016142 at 10.77.27.103
CSeq: 1 INVITE
d: no-fork
Privacy: none
P-Asserted-Identity: <sip:+18165116504;oli=62;rn=+1229218 at 10.77.27.103:20065
;user=phone>
Require: 100rel
Accept: application/sdp
k: histinfo,resource-priority
c: application/sdp
m: <sip:10.77.27.103:20065>
Allow: ACK,BYE,CANCEL,INFO,INVITE,OPTIONS,PRACK,UPDATE
l:   228

v=0
o=PVG 1452710812870 1452710812870 IN IP4 10.77.160.55
s=-
c=IN IP4 10.77.160.55
t=0 0
m=audio 37700 RTP/AVP 0 101
b=AS:80
b=RR:0
b=RS:0
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-15
a=ptime:20
a=maxptime:20

<--- Transmitting SIP response (495 bytes) to UDP:10.77.27.103:20065 --->
SIP/2.0 421 Extension Required
Via: SIP/2.0/UDP 10.77.27.103:20065
;rport=20065;received=10.77.27.103;branch=z9hG4bK0020C575A392E895C39051;oc-accept
Call-ID: 117620342110831512016142 at 10.77.27.103
From: <sip:+18165116504 at 10.77.27.103
;user=phone>;tag=000010847511385389740959
To: <sip:+18165116504 at 12.4.240.200
;user=phone>;tag=z9hG4bK0020C575A392E895C39051
CSeq: 1 INVITE
Require: 100rel
Supported: 100rel, timer, replaces, norefersub
Server: Asterisk PBX 13.3.0-rc1
Content-Length:  0

PJSIP Endpoint:
zeus*CLI> pjsip show endpoint erc905

 Endpoint:  <Endpoint/CID.....................................>
 <State.....>  <Channels.>
    I/OAuth:
 <AuthId/UserName...........................................................>
        Aor:  <Aor............................................>
 <MaxContact>
      Contact:  <Aor/ContactUri...............................>
 <Status....>  <RTT(ms)..>
  Transport:  <TransportId........>  <Type>  <cos>  <tos>
 <BindAddress..................>
   Identify:
 <Identify/Endpoint.........................................................>
        Match:  <ip/cidr.........................>
    Channel:  <ChannelId......................................>
 <State.....>  <Time(sec)>
        Exten: <DialedExten...........>  CLCID: <ConnectedLineCID.......>
 =========================================================================================

 Endpoint:  erc905                                               Invalid
    0 of inf
        Aor:  erc905                                             0
      Contact:  erc905/sip:10.77.27.103:5060                     Avail
         32.887
  Transport:  ngvn                      udp      0     40  12.4.240.200:5060
   Identify:  erc905_1/erc905
        Match: 10.77.27.103/32


 ParameterName                 : ParameterValue
 ====================================================
 100rel                        : required
 accountcode                   :
 aggregate_mwi                 : true
 allow                         : (ulaw)
 allow_subscribe               : true
 allow_transfer                : true
 aors                          : erc905
 auth                          :
 call_group                    :
 callerid                      : <unknown>
 callerid_privacy              : allowed_not_screened
 callerid_tag                  :
 connected_line_method         : invite
 context                       : from_pstn
 cos_audio                     : 0
 cos_video                     : 0
 device_state_busy_at          : 0
 direct_media                  : true
 direct_media_glare_mitigation : none
 direct_media_method           : invite
 disable_direct_media_on_nat   : false
 dtls_ca_file                  :
 dtls_ca_path                  :
 dtls_cert_file                :
 dtls_cipher                   :
 dtls_fingerprint              : SHA-256
 dtls_private_key              :
 dtls_rekey                    : 0
 dtls_setup                    : active
 dtls_verify                   : No
 dtmf_mode                     : rfc4733
 fax_detect                    : false
 force_avp                     : false
 force_rport                   : true
 from_domain                   :
 from_user                     :
 ice_support                   : false
 identify_by                   : username
 inband_progress               : false
 language                      :
 mailboxes                     :
 media_address                 :
 media_encryption              : none
 media_encryption_optimistic   : false
 media_use_received_transport  : false
 message_context               :
 moh_suggest                   : default
 mwi_from_user                 :
 named_call_group              :
 named_pickup_group            :
 one_touch_recording           : false
 outbound_auth                 :
 outbound_proxy                :
 pickup_group                  :
 record_off_feature            : automixmon
 record_on_feature             : automixmon
 rewrite_contact               : false
 rtp_engine                    : asterisk
 rtp_ipv6                      : false
 rtp_symmetric                 : false
 sdp_owner                     : -
 sdp_session                   : Asterisk
 send_diversion                : true
 send_pai                      : true
 send_rpid                     : false
 set_var                       :
 srtp_tag_32                   : false
 sub_min_expiry                : 0
 t38_udptl                     : false
 t38_udptl_ec                  : none
 t38_udptl_ipv6                : false
 t38_udptl_maxdatagram         : 0
 t38_udptl_nat                 : false
 timers                        : yes
 timers_min_se                 : 90
 timers_sess_expires : 1800
tone_zone :
tos_audio : 0
tos_video : 0
transport : ngvn
trust_id_inbound : false
trust_id_outbound : false
use_avpf : false
use_ptime : false
user_eq_phone : false
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