[Feb 19 11:45:35] NOTICE[7842]: res_pjsip_session.c:4030 new_invite: 168: Call (TCP:192.168.18.151:40931) to extension '168' rejected because extension not found in context 'internal'

[zaryabkhan (Muhammad Zaryab Khan)]

My configuration of pjsip look like this
[167]

auth_type=userpass

type=auth

username=167

password=167

[167]

type=aor

qualify_frequency=60

max_contacts=1

remove_existing=yes

qualify_timeout=3.0

authenticate_qualify=no

[167]

context=internal

auth=167

aors=167

type=endpoint

language=en

deny=0.0.0.0/0.0.0.0

trust_id_inbound=yes

send_rpid=no

transport=tcp_transport

rtcp_mux=no

call_group=

pickup_group=

disallow=all

allow=ulaw,alaw,gsm

mailboxes=300

permit=0.0.0.0/0.0.0.0

ice_support=no

use_avpf=no

dtls_cert_file=

dtls_private_key=

dtls_ca_file=

dtls_setup=actpass

dtls_verify=no

media_encryption=no

message_context=

subscribe_context=

allow_subscribe=yes

rtp_symmetric=yes

force_rport=yes

rewrite_contact=yes

direct_media=no

media_use_received_transport=no

callerid=“linuxhelp” <167>

[168]

auth_type=userpass

type=auth

username=168

password=168

[168]

type=aor

qualify_frequency=60

max_contacts=1

remove_existing=yes

qualify_timeout=3.0

authenticate_qualify=no

[168]

context=internal

auth=168

aors=168

type=endpoint

language=en

deny=0.0.0.0/0.0.0.0

trust_id_inbound=yes

send_rpid=no

transport=tcp_transport

rtcp_mux=no

call_group=

pickup_group=

disallow=all

allow=ulaw,alaw,gsm

mailboxes=300

permit=0.0.0.0/0.0.0.0

ice_support=no

use_avpf=no

dtls_cert_file=

dtls_private_key=

dtls_ca_file=

dtls_setup=actpass

dtls_verify=no

media_encryption=no

message_context=

subscribe_context=

allow_subscribe=yes

rtp_symmetric=yes

force_rport=yes

rewrite_contact=yes

direct_media=no

media_use_received_transport=no

callerid=“linuxhelp2” <168>

[tcp_transport]

type=transport ; Must be of type ‘transport’

protocol=tcp

bind=0.0.0.0

tos=cs3

cos=3

allow_reload=false

[udp_transport]

type=transport ; Must be of type ‘transport’

protocol=udp

bind=0.0.0.0

tos=cs3

cos=3

allow_reload=false

and dialplan look like this
[internal]
exten => 167,1,Dial(PJSIP/167)
exten => 168,2,Dial(PJSIP/168)

when i make call it provide me this error

[Feb 19 11:45:35] NOTICE[7842]: res_pjsip_session.c:4030 new_invite: 168: Call (TCP:192.168.18.151:40931) to extension ‘168’ rejected because extension not found in context ‘internal’.

[Stewart1 (Stewart)]

This is a FreePBX forum. Nothing in your post seems related to FreePBX.
If you are using plain Asterisk, your question is better asked at

Asterisk Community

If you are using a competing Asterisk-based PBX, you should ask in whatever community they may have.

An immediate issue is that you have
exten => 168,2,Dial(PJSIP/168)
so there is no priority 1 for 168.

You can try changing it to
exten => 168,1,Dial(PJSIP/168)
and your call will likely get further, but I’m not an Asterisk expert and may be missing other important errors in your configuration.

While there are Asterisk experts who read this forum, they do so for the purpose of helping FreePBX users and developers, so you should ask your questions in a more appropriate community.