Re: uac_replace_to() generates double angle brackets in To header when display name is used in kamailio 6.1.2

David,

Just to clarify, are you sure you're not using this function twice 
across the config?

Regards,
Ihor

Le 19/05/2026 à 06:15, David Escartin Almudevar via sr-users a écrit :
> Hello,
>
> I am seeing a possible issue with `uac_replace_to()` in Kamailio 6.1.2.
>
> Version:
>
> ```text
> kamailio 6.1.2 (x86_64/linux) 1b2dad-dirty
> ```
>
> I am calling `uac_replace_to()` passing both a display name and a To URI.
> ```text
> DEBUG: uac [uac.c:588]: ki_replace_to(): dsp=0x7ffca81777a0 (len=15) , uri=0x7ffca81777b0 (len=41)
> DEBUG: uac [replace.c:341]: replace_uri(): adding new display ["+818067029073"]
> DEBUG: uac [replace.c:368]: replace_uri(): uri to replace [sip:[email protected]:5065]
> DEBUG: uac [replace.c:369]: replace_uri(): replacement uri is [sip:[email protected];user=phone]
> DEBUG: uac [replace.c:434]: replace_uri(): Stored <_uac_to> var in dialog with value sip:[email protected]:5065
> DEBUG: uac [replace.c:454]: replace_uri(): Stored <_uac_tonew> var in dialog with value sip:[email protected];user=phone
> DEBUG: uac [replace.c:468]: replace_uri(): Stored <_uac_tdp> var in dialog with value
> DEBUG: uac [replace.c:483]: replace_uri(): Stored <_uac_tdpne> var in dialog with value "+818067029073"
> ```
> The replacement seems to work internally, but the outgoing INVITE sent to the callee contains double angle brackets in the `To` header.
>
> The resulting header is:
>
> ```text
> To: "+818067029073" <<sip:[email protected];user=phone>>
> ```
> And I get the folloing error when processing the response from UAS
> ```
> May 19 03:42:19 ip-10-100-10-19 /usr/local/kamailio/sbin/kamailio[3562]: ERROR: <core> [core/parser/parse_addr_spec.c:754]: parse_addr_spec(): unexpected char [</60] in status 5: [+818067029073 <] .
> May 19 03:42:19 ip-10-100-10-19 /usr/local/kamailio/sbin/kamailio[3562]: ERROR: <core> [core/parser/parse_to.c:56]: parse_to_body(): bad to header
> May 19 03:42:19 ip-10-100-10-19 /usr/local/kamailio/sbin/kamailio[3562]: ERROR: <core> [core/parser/msg_parser.c:342]: parse_headers(): bad header field [To: +818067029073 <<sip:[email protected];user=phone>>;tag=1803SIPpTag011
> May 19 03:42:19 ip-10-100-10-19 /usr/local/kamailio/sbin/kamailio[3562]: ERROR: <core> [core/receive.c:398]: receive_msg(): parsing relevant headers failed
> May 19 03:42:19 ip-10-100-10-19 /usr/local/kamailio/sbin/kamailio[3562]: ERROR: <core> [core/receive.c:558]: receive_msg(): required headers not found in reply
> ```
>
> If a pass the replace uri enclosed in brackets (<sip:[email protected];user=phone>), then i obtain a To header with triple <....> and I get the folowing error processing the response from callee
> ```text
> May 19 03:43:31 ip-10-100-10-19 /usr/local/kamailio/sbin/kamailio[4136]: ERROR: <core> [core/parser/parse_to.c:56]: parse_to_body(): bad to header
> May 19 03:43:31 ip-10-100-10-19 /usr/local/kamailio/sbin/kamailio[4136]: ERROR: <core> [core/parser/msg_parser.c:342]: parse_headers(): bad header field [To: +818067029073 <<<sip:[email protected];user=phone>>>;tag=1803SIPpTag012
> ```
>
> Is this a known issue in 6.1.2, or am I passing the URI/display name in the wrong format?
>
> >From the debug logs, the replacement URI appears to be stored without angle brackets, but the final generated `To` header contains:
>
> ```text
> <<sip:[email protected];user=phone>>
> ```
>
> Thanks in advance.
> David Escartín
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