Remove route prefix when call is connected

Hi! I apologize if this topic has already been discussed before. I reall y couldn’t find a solution.
I’m using RasPBX running FreePBX 15.0.37. My extensions and trunks use PJSIP.
To place a call I dial 9-NXXXXX as outbound route. My phone screen still shows that 9 when the call is connected.
I tried changing different settings unsuccessfully.

These are my settings for a trunk

type=endpoint
transport=0.0.0.0-udp
context=from-trunk
disallow=all
allow=alaw,ulaw,gsm
aors=4411998
send_connected_line=true
language=es_ar
user_eq_phone=no
t38_udptl=no
t38_udptl_ec=none
fax_detect=no
trust_id_inbound=yes
t38_udptl_nat=no
send_pai=yes
rtp_symmetric=yes
dtmf_mode=rfc4733

I think there’s a problem in using PJSIP channels because with regular SIP it works perfectly.

Any ideas?

Because the prefix stripping is handled by FreePBX, the phone surely has no way of knowing that you’ve stripped the 9?

The phone is correctly displaying the number dialled.

In principle, the provider could provide a connected line update, and FreePBX might propagate that back to the phone. It would need trust connected line updates setting on the trunk, but that seems to be the Asterisk default, although FreePBX might override it.

Whether the provider does and how FreePBX, and the phone, handles it, are different questions.

I tried adding that setting but it doesn´t strip the outbound route prefix.

My trunk is set to connect a Grandstream FXO. The route prefix is stripped if I use a SIP trunk but not a PJSIP trunk.

These are my trunk settings taken from asterisk CLI:

ParameterName                      : ParameterValue
 ================================================================
 100rel                             : yes
 accept_multiple_sdp_answers        : false
 accountcode                        : 
 acl                                : 
 aggregate_mwi                      : true
 allow                              : (alaw|ulaw|gsm)
 allow_overlap                      : true
 allow_subscribe                    : true
 allow_transfer                     : true
 allow_unauthenticated_options      : false
 aors                               : MyTrunk
 asymmetric_rtp_codec               : false
 auth                               : 
 bind_rtp_to_media_address          : false
 bundle                             : false
 call_group                         : 
 callerid                           : <unknown>
 callerid_privacy                   : allowed_not_screened
 callerid_tag                       : 
 connected_line_method              : invite
 contact_acl                        : 
 context                            : from-trunk
 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_auto_generate_cert            : No
 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
 fax_detect_timeout                 : 0
 follow_early_media_fork            : true
 force_avp                          : false
 force_rport                        : true
 from_domain                        : 
 from_user                          : 
 g726_non_standard                  : false
 ice_support                        : false
 identify_by                        : username,ip
 ignore_183_without_sdp             : false
 inband_progress                    : false
 incoming_mwi_mailbox               : 
 language                           : es_ar
 mailboxes                          : 
 max_audio_streams                  : 1
 max_video_streams                  : 1
 media_address                      : 
 media_encryption                   : no
 media_encryption_optimistic        : false
 media_use_received_transport       : false
 message_context                    : 
 moh_passthrough                    : false
 moh_suggest                        : default
 mwi_from_user                      : 
 mwi_subscribe_replaces_unsolicited : no
 named_call_group                   : 
 named_pickup_group                 : 
 notify_early_inuse_ringing         : false
 one_touch_recording                : false
 outbound_auth                      : 
 outbound_proxy                     : 
 pickup_group                       : 
 preferred_codec_only               : false
 record_off_feature                 : automixmon
 record_on_feature                  : automixmon
 refer_blind_progress               : true
 rewrite_contact                    : false
 rpid_immediate                     : false
 rtcp_mux                           : false
 rtp_engine                         : asterisk
 rtp_ipv6                           : false
 rtp_keepalive                      : 0
 rtp_symmetric                      : true
 rtp_timeout                        : 0
 rtp_timeout_hold                   : 0
 sdp_owner                          : -
 sdp_session                        : Asterisk
 send_connected_line                : yes
 send_diversion                     : true
 send_history_info                  : false
 send_pai                           : true
 send_rpid                          : false
 set_var                            : 
 srtp_tag_32                        : false
 stir_shaken                        : false
 sub_min_expiry                     : 0
 subscribe_context                  : 
 suppress_q850_reason_headers       : false
 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                          : 0.0.0.0-udp
 trust_connected_line               : yes
 trust_id_inbound                   : true
 trust_id_outbound                  : true
 use_avpf                           : false
 use_ptime                          : false
 user_eq_phone                      : false
 voicemail_extension                : 
 webrtc                             : no

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