Description

using KEMI API in Python v2.7.18 for Kamailio v5.6.2, I encounter error in ksr_onsend_route, it always gives following error,

ERROR: app_python [python_support.c:154]: python_handle_exception(): apy_exec: ksr_onsend_route((null)): Unhandled exception in the Python code: 
TypeError: an integer is required

Troubleshooting

Above error happens even if there is no code in this function and it returns success, e.g.

...
    def ksr_onsend_route(self, msg):
        return 1

...

Reproduction

It happens always whenever ksr_onsend_route function exists in kamailio class in KEMI python configuration for kamailio.

Debugging Data

Nothing relevant in debug even with debug=9 set.

Log Messages

ERROR: app_python [python_support.c:154]: python_handle_exception(): apy_exec: ksr_onsend_route((null)): Unhandled exception in the Python code: 
TypeError: an integer is required

SIP Traffic

REGISTER sip:voip-test.sip-domain.de:5060 SIP/2.0.
Via: SIP/2.0/UDP x.x.x.x:5060;branch=z9hG4bK-1523596-64-0.
From: <sip:490000063@voip-test.sip-domain.de:5060>;tag=64.
To: <sip:490000063@voip-test.sip-domain.de:5060>.
Call-ID: call_id_64.
CSeq: 1 REGISTER.
Contact: sip:490000063@x.x.x.x:5060.
Max-Forwards: 70.
Content-Length: 0.
..

Possible Solutions

I suspect the problem is at low level (native code) of app_python module.

Additional Information

version: kamailio 5.6.2 (x86_64/linux) 
flags: USE_TCP, USE_TLS, USE_SCTP, TLS_HOOKS, USE_RAW_SOCKS, DISABLE_NAGLE, USE_MCAST, DNS_IP_HACK, SHM_MMAP, PKG_MALLOC, Q_MALLOC, F_MALLOC, TLSF_MALLOC, DBG_SR_MEMORY, USE_FUTEX, FAST_LOCK-ADAPTIVE_WAIT, USE_DNS_CACHE, USE_DNS_FAILOVER, USE_NAPTR, USE_DST_BLOCKLIST, HAVE_RESOLV_RES, TLS_PTHREAD_MUTEX_SHARED
ADAPTIVE_WAIT_LOOPS 1024, MAX_RECV_BUFFER_SIZE 262144, MAX_URI_SIZE 1024, BUF_SIZE 65535, DEFAULT PKG_SIZE 8MB
poll method support: poll, epoll_lt, epoll_et, sigio_rt, select.
id:  
compiled with gcc 10.2.1

Python 2.7.18

Linux test-sip-server 5.10.0-17-amd64 #1 SMP Debian 5.10.136-1 (2022-08-13) x86_64 GNU/Linux

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