res_pjsip_endpoint_identifier_ip: Add endpoint identifier transport address.

Add a new identify_by option to res_pjsip_endpoint_identifier_ip
called 'transport' this matches endpoints based on the bound
ip address (local) instead of the 'ip' option, which matches on
the source ip address (remote).

UserNote: set identify_by=transport for the pjsip endpoint. Then
use the existing 'match' option and the new 'transport' option of
the identify.

Fixes: #672
(cherry picked from commit c8769f3d5a)

contrib/ast-db-manage/config/versions/d5122576cca8_add_transport_attribute_to_identify.py

@@ -0,0 +1,20 @@
+"""add transport attribute to identify
+
+Revision ID: d5122576cca8
+Revises: cf150a175fd3
+Create Date: 2024-03-28 14:29:43.372496
+
+"""
+
+# revision identifiers, used by Alembic.
+revision = 'd5122576cca8'
+down_revision = 'cf150a175fd3'
+
+from alembic import op
+import sqlalchemy as sa
+
+def upgrade():
+    op.add_column('ps_endpoint_id_ips', sa.Column('transport', sa.String(128)))
+
+def downgrade():
+    op.drop_column('ps_endpoint_id_ips', 'transport')