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Beginner

VCS <-> CUCM SIP Calls Don't Disconnect

I have a VCS Control X7.2.1 and CUCM 8.0. The setup is otherwise working correctly except for one issue. When a VCS registered video device is connected with a phone on the CUCM side (internal or on the PSTN), if the phone on the CUCM side hangs up the call, the VCS resgistred video device does not disconnect (the endpoint still shows in the call, the VCS still shows a call is connected). I don't know what it shows on the CUCM side (I am not the admin for the CUCM). Note, this happens only with SIP <-> SIP calls.  If the call is internworked (H323 <-> SIP) the call is disconnected properly.

As mentioned, calls are all connecting properly and this is the only issue. For the VCS <-> CUCM zone on the VCS, I am using the CUCM profile that comes with the VCS box. It is a SIP only zone. The VCS's general SIP settings are default.

4 REPLIES 4
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Enthusiast

VCS <-> CUCM SIP Calls Don't Disconnect

Hi Timothy

Did you find a solution for that?

/Martin

Beginner

VCS <-> CUCM SIP Calls Don't Disconnect

Hi Martin,

No I did not find a solution. SIP to SIP calls initiated on the CUCM side will not disconnect.

The ultimate work around is I configured the VCSC search rules to force all VCSC<->CUCM calls to be interworked to H323 on the VCSC side. With the call interworked the problem does not exist.

VIP Advisor

VCS <-> CUCM SIP Calls Don't Disconnect

have you checked if you have a VCS interoperability normalisation script enable on the CUCM side of the VCS-CUCM trunk?

here's an example:

--[[

    Description:

        Provides interoperability for endpoints registered to the Video Communications Server (VCS)

        1. Use configured top-level-domain for calling party number.

        2. If Tandberg includes crypto but audio/video profile is AVP, change it to SAVP and

           include the X-cisco-srtp-fallback supported option. This allows endpoints to

           use SRTP if both sides support it or fallback to RTP if either side does not.

    Script Parameters:

        top-level-domain --   Configure this parameter if the script needs to convert From,

                              Remote-Party-ID, and P-Asserted-Identity headers so that the

                              host portion of the URI is the configured top-level-domain.

    Release: 8.6(1)

    Copyright (c) 2009-2011 Cisco Systems, Inc. All rights reserved.

    All rights reserved.

--]]

M = {}

local top_level_domain = scriptParameters.getValue("top-level-domain")

local function getMediaDescriptions(sdp)

    -- initialize table of media descriptions

    local mds = {}

    -- there won't be more than 10 media descrpitions; loop below exits on the first index

    -- that returns nil; that will be the one after the last valid index

    for i = 1, 10

    do

        mds[i] = sdp:getMediaDescription(i)

        if not mds[i]

        then

            -- the last one we got was the last media description in this SDP; exit the loop

            break

        end

    end

    return mds

end

local function avp_to_savp(md)

    -- returns modified media descriptions if m-line contains RTP/AVP and there is a crypto line;

    -- otherwise returns nil if the media descrpition was not modified.

    if not md

    then

        -- media description was NOT modified

        return nil

    end

    local crypto = md:getLine("a=", "crypto")

    if md:match("RTP/AVP") and crypto

    then

        md = md:gsub("RTP/AVP", "RTP/SAVP")

        return md

    end

    -- media description was NOT modified

    return nil

end

local function inbound_srtp_fallback(msg, sdp, mds)

    for i, md in ipairs(mds)

    do 

        --trace.format("media description[%d] \n===>\n%s<===\n", i, md)

        local md_savp = avp_to_savp(md)

        if md_savp

        then

            sdp = sdp:modifyMediaDescription(i, md_savp)

        end

    end

    -- we may have changed several media descriptions but only need to add the header once

    msg:addHeader("Supported", "X-cisco-srtp-fallback")

    return sdp

end

local function savp_to_avp(md)

    -- returns modified media descriptions if m-line contains RTP/SAVP and there is a crypto line;

    -- otherwise returns nil if the media descrpition was not modified.

    if not md

    then

        -- media description was NOT modified

        return nil

    end

    local crypto = md:getLine("a=", "crypto")

    if md:match("RTP/SAVP") and crypto

    then

        md = md:gsub("RTP/SAVP", "RTP/AVP")

        return md

    end

    -- media description was NOT modified

    return nil

end

local function outbound_srtp_fallback(msg, sdp, mds)

    for i, md in ipairs(mds)

    do 

        --trace.format("media description[%d] \n===>\n%s<===\n", i, md)

        local md_avp = savp_to_avp(md)

        if md_avp

        then

            sdp = sdp:modifyMediaDescription(i, md_avp)

        end

    end

    return sdp

end

local function remove_malformed_media_description(sdp)

    local mds = getMediaDescriptions(sdp)

    local malformed_index = 0

    for i, md in ipairs(mds)

    do

        if md:match("m=application %d+ RTP/AVP\r?\n")

        then

            malformed_index = i

            break

        end

    end

    if malformed_index > 0

    then

        return sdp:removeMediaDescription(malformed_index)

    end

    return sdp

end

local function process_inbound_SDP(msg)

    local sdp = msg:getSdp()

    if not sdp

    then

        -- there is no inbound SDP

        return

    end

    local context = msg:getContext()

    -- get a table (indexed by media level) of the media descriptions

    local mds = getMediaDescriptions(sdp)

    sdp = inbound_srtp_fallback(msg, sdp, mds)

    msg:setSdp(sdp)

end

local function modify_rhs_of_uri(msg, header, rhs)

    local value = msg:getHeader(header)

    if value and rhs

    then

        local replacePattern = string.format("<>", "%1", rhs)

        value = value:gsub("<>", replacePattern)

        msg:modifyHeader(header, value)

    end

end

local function modify_rhs_of_uri_for_calling_party(msg)

    if not top_level_domain

    then

        return

    end

    modify_rhs_of_uri(msg, "From", top_level_domain)

    modify_rhs_of_uri(msg, "Remote-Party-Id", top_level_domain)

    modify_rhs_of_uri(msg, "P-Asserted-Identity", top_level_domain)

end

local function process_outbound_SDP(msg, isInvite)

    local sdp = msg:getSdp()

    if isInvite

    then

        if msg:isInitialInviteRequest()

        then

            -- get a table (indexed by media level) of the media descriptions

            local mds = getMediaDescriptions(sdp)

            sdp = outbound_srtp_fallback(msg, sdp, mds)

        end

    end

    -- remove application media description if it doesn't contain payloads

    sdp = remove_malformed_media_description(sdp)

    msg:setSdp(sdp)

end

local function process_outbound_request(msg, isInvite)

    modify_rhs_of_uri_for_calling_party(msg)

    process_outbound_SDP(msg, isInvite)

end

M.inbound_INVITE     = process_inbound_SDP

M.inbound_18X_INVITE = process_inbound_SDP

M.inbound_200_INVITE = process_inbound_SDP

M.inbound_PRACK      = process_inbound_SDP

M.inbound_200_PRACK  = process_inbound_SDP

M.inbound_ACK        = process_inbound_SDP

M.inbound_UPDATE     = process_inbound_SDP

M.inbound_200_UPDATE = process_inbound_SDP

M.outbound_INVITE     = function(msg)

    process_outbound_request(msg, true)

end

M.outbound_18X_INVITE = process_outbound_SDP

M.outbound_200_INVITE = process_outbound_SDP

M.outbound_PRACK      = process_outbound_request

M.outbound_200_PRACK  = process_outbound_SDP

M.outbound_ACK        = process_outbound_request

M.outbound_UPDATE     = process_outbound_request

M.outbound_200_UPDATE = process_outbound_SDP

return M

--[[

    Description:

        Provides interoperability for endpoints registered to the Video Communications Server (VCS)

        1. Use configured top-level-domain for calling party number.

        2. If Tandberg includes crypto but audio/video profile is AVP, change it to SAVP and

           include the X-cisco-srtp-fallback supported option. This allows endpoints to

           use SRTP if both sides support it or fallback to RTP if either side does not.

    Script Parameters:

        top-level-domain --   Configure this parameter if the script needs to convert From,

                              Remote-Party-ID, and P-Asserted-Identity headers so that the

                              host portion of the URI is the configured top-level-domain.

    Release: 8.6(1)

    Copyright (c) 2009-2011 Cisco Systems, Inc. All rights reserved.

    All rights reserved.

--]]

M = {}

local top_level_domain = scriptParameters.getValue("top-level-domain")

local function getMediaDescriptions(sdp)

    -- initialize table of media descriptions

    local mds = {}

    -- there won't be more than 10 media descrpitions; loop below exits on the first index

    -- that returns nil; that will be the one after the last valid index

    for i = 1, 10

    do

        mds[i] = sdp:getMediaDescription(i)

        if not mds[i]

        then

            -- the last one we got was the last media description in this SDP; exit the loop

            break

        end

    end

    return mds

end

local function avp_to_savp(md)

    -- returns modified media descriptions if m-line contains RTP/AVP and there is a crypto line;

    -- otherwise returns nil if the media descrpition was not modified.

    if not md

    then

        -- media description was NOT modified

        return nil

    end

    local crypto = md:getLine("a=", "crypto")

    if md:match("RTP/AVP") and crypto

    then

        md = md:gsub("RTP/AVP", "RTP/SAVP")

        return md

    end

    -- media description was NOT modified

    return nil

end

local function inbound_srtp_fallback(msg, sdp, mds)

    for i, md in ipairs(mds)

    do 

        --trace.format("media description[%d] \n===>\n%s<===\n", i, md)

        local md_savp = avp_to_savp(md)

        if md_savp

        then

            sdp = sdp:modifyMediaDescription(i, md_savp)

        end

    end

    -- we may have changed several media descriptions but only need to add the header once

    msg:addHeader("Supported", "X-cisco-srtp-fallback")

    return sdp

end

local function savp_to_avp(md)

    -- returns modified media descriptions if m-line contains RTP/SAVP and there is a crypto line;

    -- otherwise returns nil if the media descrpition was not modified.

    if not md

    then

        -- media description was NOT modified

        return nil

    end

    local crypto = md:getLine("a=", "crypto")

    if md:match("RTP/SAVP") and crypto

    then

        md = md:gsub("RTP/SAVP", "RTP/AVP")

        return md

    end

    -- media description was NOT modified

    return nil

end

local function outbound_srtp_fallback(msg, sdp, mds)

    for i, md in ipairs(mds)

    do 

        --trace.format("media description[%d] \n===>\n%s<===\n", i, md)

        local md_avp = savp_to_avp(md)

        if md_avp

        then

            sdp = sdp:modifyMediaDescription(i, md_avp)

        end

    end

    return sdp

end

local function remove_malformed_media_description(sdp)

    local mds = getMediaDescriptions(sdp)

    local malformed_index = 0

    for i, md in ipairs(mds)

    do

        if md:match("m=application %d+ RTP/AVP\r?\n")

        then

            malformed_index = i

            break

        end

    end

    if malformed_index > 0

    then

        return sdp:removeMediaDescription(malformed_index)

    end

    return sdp

end

local function process_inbound_SDP(msg)

    local sdp = msg:getSdp()

    if not sdp

    then

        -- there is no inbound SDP

        return

    end

    local context = msg:getContext()

    -- get a table (indexed by media level) of the media descriptions

    local mds = getMediaDescriptions(sdp)

    sdp = inbound_srtp_fallback(msg, sdp, mds)

    msg:setSdp(sdp)

end

local function modify_rhs_of_uri(msg, header, rhs)

    local value = msg:getHeader(header)

    if value and rhs

    then

        local replacePattern = string.format("<>", "%1", rhs)

        value = value:gsub("<>", replacePattern)

        msg:modifyHeader(header, value)

    end

end

local function modify_rhs_of_uri_for_calling_party(msg)

    if not top_level_domain

    then

        return

    end

    modify_rhs_of_uri(msg, "From", top_level_domain)

    modify_rhs_of_uri(msg, "Remote-Party-Id", top_level_domain)

    modify_rhs_of_uri(msg, "P-Asserted-Identity", top_level_domain)

end

local function process_outbound_SDP(msg, isInvite)

    local sdp = msg:getSdp()

    if isInvite

    then

        if msg:isInitialInviteRequest()

        then

            -- get a table (indexed by media level) of the media descriptions

            local mds = getMediaDescriptions(sdp)

            sdp = outbound_srtp_fallback(msg, sdp, mds)

        end

    end

    -- remove application media description if it doesn't contain payloads

    sdp = remove_malformed_media_description(sdp)

    msg:setSdp(sdp)

end

local function process_outbound_request(msg, isInvite)

    modify_rhs_of_uri_for_calling_party(msg)

    process_outbound_SDP(msg, isInvite)

end

M.inbound_INVITE     = process_inbound_SDP

M.inbound_18X_INVITE = process_inbound_SDP

M.inbound_200_INVITE = process_inbound_SDP

M.inbound_PRACK      = process_inbound_SDP

M.inbound_200_PRACK  = process_inbound_SDP

M.inbound_ACK        = process_inbound_SDP

M.inbound_UPDATE     = process_inbound_SDP

M.inbound_200_UPDATE = process_inbound_SDP

M.outbound_INVITE     = function(msg)

    process_outbound_request(msg, true)

end

M.outbound_18X_INVITE = process_outbound_SDP

M.outbound_200_INVITE = process_outbound_SDP

M.outbound_PRACK      = process_outbound_request

M.outbound_200_PRACK  = process_outbound_SDP

M.outbound_ACK        = process_outbound_request

M.outbound_UPDATE     = process_outbound_request

M.outbound_200_UPDATE = process_outbound_SDP

return M



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Beginner

VCS <-> CUCM SIP Calls Don't Disconnect

this is a new bug : CSCul01863

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